Light - Reflection & Refraction 🔥| CLASS 10 Science | Complete Chapter | NCERT Covered

0:00 Are you scared of science? hey but why To fear when your Prashant bhaiya is here. So hi everyone I am yours Prashant Bhaiya and I am back again with a new With a one shot and the chapter is named Light. Yes, this is the same chapter that you are scared of. You stay here, you stay afraid. Bhaiya Numerical If it could not be solved, it will be solved today. Brother this How to make a ray diagram? such a trick I will tell you that you would not have thought of it. Isn't it? So this whole chapter is funny in one shot interesting in a fun way Many more questions will be asked in this manner. These question board in your exams Inside exams, inside school exams The chances of repeat are very high Are. Ok? We will do everything in detail. Is No? Just keep this in mind. Why to Fear When your Prashant bhaiya is here. Ok? Whenever you face a problem, your brother

0:46 He is standing here. Ok? your elder brother He is standing here. You don't need that much load Is. I am. ok sir. what a very nice The banner has been made. Look how beautiful you look I have been. Well I am beautiful but Ok. ok sir. what are we doing today Are you going to? What topics to cover Are you going to? All the topics which you There are reflections in NCERT of Light, Spherical Mirror, Sign Convention, We will do numerical, refraction of light do. Then the lens will also read and power off The lenses are also completing the whole thing Will be. Ok? Will read it in a fun way. The notes will be uploaded to you on Telegram. Or I can also put the link in the description Give. Isn't it? So take notes later on I will watch the lecture first. Later Notes download. Don't run after the notes right now. Isn't it? Well, I know those students feels the worst for the sit in class and make notes and When friend asks him brother notes If you give it to me, I take a lot of good photos and

1:33 send the notes. But there, when he Students ask for notes from someone else. Isn't it? Brother, I did not make notes. If they give me the notes then there is no help for them Would do. Isn't it? I feel bad for them, man. Never mind, but I am a good person. I will give you notes. Come on. starting up Are. What is light? Light brother our life There is darkness in me. Oh no, not in life There will be light for you too. First understand the light What is? So what is light? light is a Form of energy. It is a very basic thing. What is an Energy Key? There is a form. a big one Let me tell you a fun fact that light it yourself is not visible. That means we cannot see the light Can. We can see everything because of light Are. Did you understand it? Now look, the light Everyone will know the speed of. 3 * 10 Re To Power 8 meters per second. Small classes I have been studying since. oh in small classes

2:19 So where did you study? No roast I am doing it, son. Ok? Isn't it? His Apart from this, light is in rectilinear motion She does. What is rectilinear motion? That means it moves straight. Isn't it? he too he is as straight as your prashant bhai At once. Ok? So rectilinear propagation That means the light goes straight. Apart from that, light can also travel in Vacuum. We already have small classes too inside the ninth class, inside the eighth class I had read it inside. Now comes the main Coming to the point which is reflection. Brother Is this about reflection? what is this new Is it a phenomenon? I said not much load Lenny. What is Reflection? tick tick tick Tick ​​tick tick means bouncing back of light. That means the light came and went Went. Isn't it? The light came, hit and went away. see Hey son, what is reflection of light. The

3:05 Phenomena of bouncing back of light rays when they strike on the surface of a Object. Isn't it? When the light came, hit and went Went. Isn't it? in the same way as he too I came into your life, collided with you and She had gone away. Ok? same way the light too She came, collided and went away. Now, very basic stuff. You have already read it. If you haven't read it then tell me I will give it. Here is a ray diagram. Let me zoom in a little on this ray diagram. That will give you clarity. Look three Things happen. first happens Incident Re. First, this diagram looks clear Everyone is feeling it, right? Let's start with the incident. this which Hey, this is your incident. That means this came I I I. Ok? Now there was a plane here Surface. what was it son? Plane surface. on this She collided and went away after colliding. we call it These are reflected rays. what do you say? Reflected ray. now draw an imaginary line

3:53 It is done. Isn't it? an imaginary line It is drawn and we call it Normal. what do you say? Normal. They What is normal? an imaginary line Perpendicular to the surface. this was the surface A perpendicular draw is made for this. You understand perpendicularity, right? 90° yes. so one Perpendicular draw is done. to him we They say it is normal. Ok? So three things are the reflected ray, an incident ray, and Normal. Ok? So these three things you Hopefully you should know that the incident happened What happens? what is reflected ray Is? Isn't it? And what is normal? What is normal? Imaginary Line Perpendicular to the surface. very nice Brother. These are very basic things. I He said, wait a little, be patient. even tougher things right now I will show you. I will show you questions that Ditto are printed in the board exams. Ok? Come come. Look, there are two laws.

4:38 Of reflection. what are the laws of Reflection? There are basic two laws. First Law what does he say? The law says that the angle of Equal to the incidence angle of reflection will be. Now you will say brother incident angle what is this? I say I will show you. Look, look at this diagram carefully. Angle What is off incidence? that angle which what is this line? Incident Re. and this What is? It is normal. This one in between You can see the angle, we call it Angle I. That means angle of incidence. Similar The angle between this and this is called It is said that angle r means angle of Reflection. It's basic. So brother the first rule is this It says that both the angles are equal Are. These will not change. Isn't it? this is yours Son, he is not like a friend. these beans will remain. These will not change. This is exactly the same

5:24 will remain. Will not commit fraud. these two We will remain the same among ourselves. so the first law says this the angle of incidence is equal to the Angle of reflection. what does the second law say Is? The second law says that the three rays are you watching ting ting ting ting ting ting ting ting ting ting ting ting ting So these three rays that you can see right? All three will be brought on the same plane Bhaiya what is a plane that plane A plane is a surface that you can see All three of these are on the same surface. For example, suppose there is a paper. Isn't it? Paper above the incident ray, reflected ray and Normal. What are all three on the same plane? I will bring it. ok sir? So remember this Your Second Law Incident Reflected Ray And what does normal lay do? There is one right Let's fly on the same plane. Come on let's go

6:09 Did everyone understand these two things? quickly Tell me quickly. ok remember one thing What is the josh meter in your lecture? They Yours should remain high. That is, energy What is a meter? Isn't it? So keep your enthusiasm It should remain high. when your master is here I can stand up and teach you with energy Is. So my friend, why aren't you here? Why are you taking the load friend? a little You have to maintain high energy. yes or else I roast you son, I roast you a lot I fight a lot, son, I have built my body I have built a body, I kill and I am I also keep a dumbbell so it has energy keep it up come on let's talk now of a new topic whose name means a There is a definition, there is a term called lateral What is inversion? What is lateral inversion? right and left and right means one go stand in the bar mirror go go Go quickly, go stand in the mirror Raise your right hand, which hand did you raise in the mirror?

6:55 Did you raise your left hand or not? If If your right is taken away son then it means Either there is something wrong with the mirror or you, son There's something wrong with me. a little tantric Call him at home. Ok? Lateral Inversion What happens? a phenomenon in which When we see the right thing in the mirror, it We see the left thing in the mirror. Ok? So what? lateral inversion is the phenomena where left and right sides of An object appears reversed. Isn't it? Appear They become reverse, that is, upside down. most of it Is this the biggest example? An example is the ambulance. the ambulance that would have been Isn't it true that 'unp' is always written upside down? You If you have ever seen an ambulance then the one which It is an ambulance, they write it upside down. Do you know Why? Because let's say I'm driving a car Am. There is an ambulance behind. I am from the glass When I look at that ambulance I will see it in the mirror It will be visible straight away. Are you understanding? Isn't it? This

7:42 Because of this, ambulance was written upside down in the ambulance goes. So a question is also asked Sometimes, sometimes. what do you mean by lateral Inversion? why is the ambulance returning Laterally inverted? why is it written upside down Is? so that the person driving in front can see the glass I look in and he sees an ambulance and he Give me way. Isn't it? hurry to the ambulance Hey brother, I have to go quickly. It is obvious. Ok? ok sir. ok now let's talk of plane mirror. the same mirror in which the right Of left, of right, yes the same one. so plane Mirror is there in all our houses. Some of its features Tell. Tell me your characteristics. Isn't it? What features can a plane mirror have Of? Come on come. A little bit of plane mirror Feature-variable play. look brother first All the images formed in a plane mirror are It becomes virtual. Brother what is this virtual Is? Virtual means fake. Please understand, son Type of Image A real image real image.

8:28 A virtual image that is in the virtual world Isn't it? like for example for example Isn't it? You messaged him and didn't reply Came. If you don't get a reply then it's no big deal Pie. Couldn't talk in the real world We can talk in the virtual world, right? A fake world, a dream world. in the same manner The image formed here is a plane mirror How do I make that? she's always virtual It seems pretentious and not real. ok remember one thing Keep it and don't let it get into your mind Keep it aside. The RealReal's big brother Inverted Real's older brother Inverted. i.e Whatever image is real, do you know how? will it be? She will vomit. Vomit. how would it be Son? Vomit. Ok? and virtual virtual Who is virtual's elder brother son? of the virtual Big brother erect. Erect means straight. Erect means straight. Is it okay son? How

9:13 will it be? Very straightforward. very nice. Isn't it? So Whenever the image becomes virtual, it will become straight. Whenever it becomes real it will cause vomiting. Ok? Now you tell yourself you stand in the mirror Go and see for yourself. is your image Is it becoming straight? if you are saying straight yes? It is not working. Son, she is becoming simple. If it is not working out for you son, then make the same call Tantric. Ok? It is obvious. It must be becoming straight. Isn't it? How? Why Will it become straight? Because that is a virtual image. So how is the virtual image always created, son? It becomes erect. very nice. well your How is image formed in a plane mirror? Laterally Inverted. I just told you, I told you. Let's see further. What is the next point? Same size of the image. That is, the image which The size will be the same as the size of the object. You went and stood in front. so as much as Your height is the same as you see in the mirror

9:59 It must be visible. Is this true? Tell me once quickly. Yes very nice. Isn't it? Very true. Everything is going well. see you next. Next point. the distance Between the image obtained from the mirror is same as the distance between the object From the Mirror. I am explaining to you son, I am not loading Take. Suppose you are looking at this mirror from the mirror. I I am standing here. This is a mirror. I stand here Am. Ok? So the image that will be formed in the mirror Behind it will also be built at the same distance as I was away from the mirror. Isn't it? I was here. There was so much distance. at the same distance My image will be created. Just saying this and nothing else not saying. Ok? So here are some points Were. Apart from this there is a point on which repeatedly Every time MCQ question is asked is the focal length of the plane mirror. Focal Length what happens? We will talk further. But just now You must always remember what the focal length is it occurs? It is infinite. son what it occurs? Infinite. So remember Focal

10:46 The length of the plane mirror is infinite. i.e We can't count him out. Even to the Did we all understand the story? Quick chat Speak inside. Now let's move ahead PK Bhaiya. Smart PK bhaiya. Towards the spherical mirror. Is everything done till here? very nice, very nice. Dude, you look at that students who study the night before You get such good marks. Is No? So imagine if you did a little bit of studying If you do it with determination, then you will create history, brother. Don't underestimate your own potential. You Be the one who reads well the night before You get the marks. So friend, there is still time. How good marks can you get? Is No? Right. Come on brother. So with the same motivation Let's move forward together. Isn't it? and in a different manner We will move forward while understanding things. Come on. See There are two types of spherical mirrors. there is one

11:32 Concave, one is convex. Bhaiya this is concave Who? hey son look hey son look See what a cave looks like? what was the cave like Is? Cave son, there is something like this. In the cave Who lives there? The bear lives. Have heard. So What is a cave like? the cave like this it occurs. So who's coming to Kev's what? Kev is coming. Kev right? if you carefully Who will you see then Kev? Kev is coming. Kew That means cave. So the concave mirror will be like this It will be like this. It is like a cave will be. What would be one side of it? Polished. It will be polished. Polished means there Pay lights cannot collide. Ok? And this which What will be the other side? These There will be a reflecting side. What will happen, son? Reflecting side. Ok? So this happened Concave Cave. What else? Convex. So Its exact opposite. What to do? Its like this Make it the opposite. Isn't it? and on the inside

12:19 Polish it. What should you do, son? the inside Polish the side. very nice. so what is this Is? Convex. What is this? Who? Cave. Kew That means cave. It will look like a cave. very nice. ok sir. These are two types of mirrors They happen. Now here you will find some things There are some important terms that you should know Should be. Lots of important terms Are. pole, center of curvature, radius of Curvature. We will understand it one by one. Ok? I'll take you back to the diagram I will bring it. That will give you more clarity Son. Ok? This is your convex. These This is your concave. I hope this image please you It will be clear. This image is clearly visible to you She must be giving it. I hope I got a little I reduce the brightness. ok sir? So that it may help you. Now now absolutely It must be looking great. Come on come. Look carefully, son, look carefully. Poll What happens? Pole. what is a poll Brother? Poll

13:05 Dance. No son, what is a poll? Poll It is this reflecting surface What is? Concave Mirror. The mid point of this its mid point is the pole, son It is called. Ok? of reflecting surface The mid point is called the pole. other than that Understand, son. if this was a reflecting surface Isn't it? So this is somehow the whole There is a small part of the circle. Isn't it? If If we imagine a complete circle If we imagine the whole circle then that The center of the circle will be a There is a center, it will be the center of Curvature. What will you tell him? will write C He has a C, right? and this will come to your center of Curvature. very nice. Very good son. Look ahead. If we pass a line, a a line which is connected by center of curvature and pole Will pass from. So what do you think about that line?

13:51 Will you say it? I will say that line Principal Axis. this is that principal Your school is not there, son. who is this Is? Principal Axis. Ok? The next thing And the most important thing is center of curvature And the pole is its midpoint, the difference between these two which is the mid point i.e. the portion in the middle yes, what do we call it? Focus. or else Principal Focus Inside Many Books It is also written. Ok? we are talking focus Are. Ok? Now understand carefully. From here Where is the distance from and to here? Centre The distance between the curvature and the pole, I call it radius of curvature. Because the distance from the center to the circle is What happens? There is a radius. read it? Hey did you read it? Yes very nice. Radius of Curvature. and from focus to pole

14:37 There is distance, what do I call this? I call this focal length. What do you say hmm son? Focal length. Ok? Focal length. I've got it? Very true. well now also Think for yourself, what was this? Mid point. These what was it? Mid point. so can i say Am? If I double the focal length That means I make the focal length two times So what will he be equal to? Radius of of the curvature. can I say this thing Am? Yes or no? Quickly, quickly. yes, very much Excellent. One thing is that friend, no matter how much you are Are the CBSE kids with them? The kids who study in CBSE are different from all others. They are different. They are unique. know why? The problem with them is that they don't know Hindi They don't know how to write nor speak English It comes. Isn't it? I would lag at both places Are. Either brother we should learn English well

15:23 I would teach you both how to speak and write Hindi I am not able to come. Isn't it? Be Relatable Went. So did you understand? How did it happen? two times of Focal length. is equal to the radius of curvature Went. very nice. very nice. Good. Now this is the reflecting surface, if this I full length of the reflecting surface If I take it out then it will be called aperture. What Will it be called? Aperture. Don't worry. all You will see the definitions. these beans With whom does this thing happen? of convex mirror with. With whom? With convex mirror. convex mirror look something like this it occurs. This is your convex mirror. Ok? What happens from the inside? Look, it is polished like this. ok sir? Now What is? These are all the things. radius of Curvature. from here to here The distance is the radius of curvature. Here But the principal focus will come and from here on What will happen till here? Focal length. What will happen

16:09 Son? Focal length. Ok? very nice. These We have completely understood the matter. I had fun. So now let's read the terms one by one Are. Do not take too much load. Come on. Look what is the pole? The pole is the center point of The Reflecting Surface. What is? The center point of the reflecting surface That will be called a pole. very nice. next. Centre What is off curvature? center of curvature what is it brother? the center of the sphere of we Mirrors Reflecting Surface Forms the Part. That means, it is a small mirror. For him If it were the whole surface, then its The midpoint would be its center what is it called? Yes, center of curvature. What is a good radius of curvature? Now! told. I just told you not to make the same mistake again. very nice. What is the principal axis? Straight line passing through pole and centre of curvature. The one who goes away after crying.

16:55 next. Principal Focus. Look where the focus is Sometimes the principal focus is also written I write. There should be no confusion. Ok? What is? is the mid point. whose mid point Is? Speak speak speak speak speak. Yes. center of Curvature and Poles. very nice. Next Focal Length. What is focal length? I told you There is distance. Last is aperture. Aperture What happens? the diameter of the Reflecting Surface. That is, reflecting What will the length of the surface be called? They It is called your aperture. what is that called Is? Aperture. tell me quickly if this Did we understand all the definitions? it Did we understand all the definitions? I am a I drink water for a minute. Come on brother, even I've got it. So now quickly tell me what happens next. I have a question. define focal length of the Spherical Mirror. What is focal length? What is the distance from where to where? is the distance from the principal focus to the pole.

17:41 Next how is it related to the radius of Curvature. so you know two times What will the focal length be equal to? radius of will be equal to the curvature. always remember this Keep. Ok? Tie a knot. Isn't it? Tie a knot. Ok? otherwise in paper If it comes then anything can happen. Ok? Yes. So that is why remember the knotism. Come on, let's play by our rules now. What are rules rules? Rules means something Such rules with the help of which we can now create images We will form a formation. Will do it further. some rules Let us understand it. Come on. Rule number one. Oho parallel to the principal axis will pass Through focus. Change it a little bit. will pass through focus and and appearers and Appears to pass through focus. That is, either

18:26 Will it pass in real or else we will feel so that she will pass it. hey what happened? Now! I will explain it to you by looking at the diagram. you understand everything will come. You are either under so much load or you are under tension How do you get stressed, friend? your Your brother is standing with you and then you are tensed Do you take it? Come on. Look, this is concave. Kew Cave cave cave yes I will remember it now. So look concave if parallel to principal axis Any light ray comes in. Ok? Any point parallel to the principal axis When light ray comes, where does it always come from Will you do it, son? With focus. From where? With focus. In the concave. But what will happen in Convex? Look, son. convex which is a mirror The diverging mirror is convex. i.e That light comes near him and he drives it away Is. This is also like that. Ok? This too Focuses tend to diverge. Whereas What is Concave doing? Concave everyone

19:13 It is mixing. While what is he doing? is diverging. So this is my Also called converging mirror. This we Also called diverging. Will read further. Now see if any light comes She will always move away from the convex. Will she go away? away. now it won't actually pass through focus but appear to Near. How does it appear? Look brother. When Real If I cannot find anyone in this world, where would I be? Do you get it? In the dream world. Very I have experience. Isn't it? Virtual World In. So track back, track, track do it. So look, it is close to focus i.e. concave or convex whenever the light is parallel then will it pass with focus or will it appear to Pass Through Focus. come on brother rule number one done Done done, there are four rules, son. Rule number two of this Opposite, if any light ray passes through the focus If you do this then it will automatically become parallel.

20:00 Let's see. Come on. like a thing in a concave We do. These light rays come from focus See. I passed it with focus. out of focus and this hit the mirror. What will happen now? Now This will automatically become parallel, son. Parallel to what? Principal Axis Parallel. Well what about in convex? Look Light Ray, where was Light Ray going? Towards focus. where are you son? Towards. Actually it did not go into focus. Towards Focus. But he is a dirty man. Convex. These It diverges. So what did he do? The son threw it away right here. Bye Bye-bye. Goodbye. It's over. Ok? So It became parallel. Ok? So, this is yours What? Rule number two. annie re passing through the The principal focus will become parallel to the Principal Axis. Rule number three and the most Easy rule easiest rule. Look son, who is at the center He is off curvature, he is a goon. What is

20:46 Son? Goon. where are my glasses? The goon one. Bring the goon's glasses brother. To become a goon it is necessary to wear glasses yes son. So the center of curvature says that Brother, if you go from me, you will come back from me will come. If you leave me, my son I will have to come back by the way. and you have no Option. So brother what is the center of curvature This is hooliganism. He might be from UP and Bihar. Isn't it? There is level in UP and Bihar. Ok? Yes. Let's see. so like the concave in the concave if you see anybody If the light ray passes through the center of curvature Is. She passed, she passed. collided. Now back it up You will have to come through this path. That means she has gone. Went I. The center of curvature speaks to me Will have to come back. this is the same thing with convex. this is in the convex

21:33 light ray thi na ye towards center of The curvature was going. Now this is back in the same will turn into the path. It is very simple. I Hope This must have become clear. rule number rule number Four is even easier than that. If any light ray Prince, whatever pole you had, that pole If it hits at any angle then it will hit the same It will reflect at an angle. I will explain How. Look, suppose it hits the pole. One He must have created the angle. You would have made an angle Son. You must have made the angle, right? Between whom? This is the angle. now when this reflects If it does then it will reflect at the same angle. That means whatever its angle will be exactly the same. Ok? Whatever this angle will be, it will be the same. these beans This happens with your convex mirror. You can see in that also, a thing collided here made an angle and then came back at the same angle what did you do? It reflected. Is this thing Is this absolutely clear to us? quickly

22:21 quickly. very nice. very nice. These So keep your energy level high son. Energy Keep the levels very high. Isn't it? Come on come on brother. Move ahead. Now comes the most important thing Which is image formation. what son? Image Formation. Now we will do image formation. These It is 1101% certain that it will appear in the paper. don't later Speak. You leak the paper. I am telling Am. I am telling you. Ok? so now now Understanding Image Formation Step by Step I will do it. Bring us a character for that It will have to be The character is Candle ji. Is it Candle Ji? To us the candle Will have to call. So come on, some candle Come on brother. So first of all the object is not an object. Respect to the candle Speak with respect, son, not an object Mr Candle. now the candle is on infinity Are. Infinity means very far. oh ho ho. Is no bro? The candle is very far away from us.

23:06 So when something is very far away, The light rays that it emits are always there Comes parallel. So you see for yourself if The candle is very far away, so its light Rays will come, how will they come, son? she will come Parallel. How will you come, son? she will come Parallel. Yes or no? Yes or no? and to you Do you know where parallel light rays collide? Are? Focus on. So where will the image be created? Focus Pay. What kind of image will be created? A small image will be created. A very small tingy-ding like image will be formed. Ok? So remember whenever you reach infinity if it happens then what would be the size of the image Is? Highly diminished. highly diminished That means very small. Ok? Now understand something Important thing. Understand a case in the mirror You. Whenever the image is on the left side of the mirror Made. where are you son? left left left Left. So what will the image always be like? Real

23:53 It will be. And who is Real's elder brother? Son? Inverted. and whenever the image is right Where is it made? In the right. so how is the image will it be? It will be virtual. and the bigger one is virtual Brother erect. Ok? now where is the image here Is it made? On the left side. So remember that The image that will be created will become real. and of the real Who is the elder brother, son? It is inverted. to everyone I know it. Ok? This is the first case. after I will also tell you the trick to remember them. There is a trick on me, P's trick. now imagine do it. Now I have kept the candles Called a little closer. There is a lot on infinity She was far away. So now candle ji is beyond the sea She has arrived. Where? Beyond C means C K Back. What is C? Center of curvature beta. This C is the center of curvature. yours I don't have any friends. So what? Behind this Candle ji, come and what is there here son? She has stood up. Now look what now? now you See. Now you see, it will be fun. See. Now what Is? Put a light ray parallel. And whenever

24:39 If the light ray goes parallel then you all will know Where will she pass that from? near focus will do it. Did you come or not? Everyone knows. Now what Do it son? the second light ray to the second light ray what do you do now? this is the center of It is curvature, send it through. Because the light Where does the ray go from the center of curvature does it come? Comes back on the same path. Isn't it? Imagine if a light ray hits you If it is sent to the center of curvature like this then it will be returned back also Where will it come from? same way back will come. Yes or no? Yes or no? Ok. So Where are these lines meeting? at this place so Where will the image be created? The reverse image will be formed and such The image will be created. well how is the image? it is real or is it virtual? Left side means real. How is the image? It is not very big. The candle was very big. this is the image Small Ok? So we can say that the image is Diminished. Diminished means small. Real and

25:26 Inverted very good. case number two understood I'm gone son. This mirror case is important. Why? because this case is not same in lens will be. It repeats and repeats. so here I am I am explaining. Understand the matter carefully. I became angry. Ok? Came. See. Now it comes Third case and the most important one. Importent It is also written. What does the case say? case this tells me if I let the candle go and I called him closer and I selected the center of curvature I made the candle stand there. Now watch Son, put a light of ray in parallel Two. Where is the parallel ray of light from? does it? Everybody knows, son. Yes. Do you know No? Do you know it or not? Correct. now the second light Ray knows where to send it? you are not focus Send another light ray. Whenever you are someone Son do you send the thing to focus. Whenever anybody What happens if the light ray passes through the focus Is? It becomes parallel. Parallel. Missing you Went? very nice. very nice. so this

26:13 It will collide and what will happen? these parallel It will happen and it will come, it will come and these will happen among themselves I will meet you here. So the image that It will be made somewhere in this direction. And Do you know exactly where the image will be made? Its Below Where? Right below this. where at Candle was there and the image was created under it Went. Yes. And tell me the best thing about this case Why is it important? the size of the image Whatever happens is the bean. the image was real Is. It is inverted. just tata bye-be good Bye. End. Go ahead. come on. case number Four. Inside this we place the candle closer I am calling you, son. So the candles came are here. Isn't it? Between C and F. Now we will do the same. What will you not do havan Son. What to do? I will cast a light ray and What to do? I have only one thing to do. Come on brother. and the second light ray now where am I should I put it? Isn't it? where am I for the second light should I put it? Now this is something to think about. Think

26:58 Son, hurry up. Where can I put it? Where Insert it son? If you want another light ray then you You can pass the exam with this kind of focus also. Any It is not a problem. Isn't it? So now this What will happen? This will become parallel. and this coming together somewhere and somewhere a little further Do you want to make this diagram a little smoother? We will meet somewhere at this place, that is, this Where can I find it behind the center of curvature? behind the center of curvature so the image which If it is made then the image will be big, how will it be Enlarge means the image will become bigger and real It will be made inverted, right, and where is it being made? Where is Beyond C being built? I will write it here beyond C Ok brother, I understood four cases very well, further Now let us come to our fifth case What is there in the fifth case, son? Now I have I called Candle closer and I made him stand here on the focal point Is. What to do? you will do what you do

27:44 Have been doing so all my life. Isn't it, son? We have So there is only one work to do. So brother one line parallel very nice. Where do I insert the second line? I will put it on the pole. At the same angle. Isn't it? remember there was a law like this and not at an angle If you put it on the pole, then it will be at the same angle What is this? It will reflect. if you If you can see then both these light rays are parallel Is. what is this? Parallel. what is parallel Do things ever match? Tell. Yes. Where Do you meet them? Infinite Pay. Infinite means Very far. So we can say that in this case The image will not form inside. Now this I Answer because of your latest NCERT I am speaking from. NCERT has been updated And some corrections have been made in that NCERT And this thing is clearly written in the correction That image is not formed inside this case. Inside Schools explains that Highly

28:31 An enlarged image will be created. yes in infinity The image will be created Look at the NCERT table which clearly states What happened is that we don't know anything about the image I can tell you because actually the image I do not want to make it. Ok? So in NCERT It has been updated. I will tell you the syllabus I have been. Now let's come to case number six. To all important most important this is a mistake Don't do wrong with that either. What did I say? Mistake Don't do wrong with that either. Ok? what's in it Brother? Are? What is so special about this? Are? Isn't it? That one picture comes, right? who asked Didn't you look back? Isn't it? so in that What is so special? What is so special about this Is? This is special, it will come in the paper. Ok? Now Look son, I brought the candle closer. I have called you and the candle has come here are between P and F. Ok? PF's Came in the middle. What should I do now? the one who does I have come. First of all you are a light

29:18 Post it from here. Isn't it? A light ray like this. Isn't it? Now many people will say that Bhaiya is one Light Ray what to do? put it parallel like this and He will pass it with such focus. is this Is the diagram correct? So this is what I believe The diagram is incorrect. Ok? Why? Because Brother, if the object is standing then the light ray is straight He will put it. So what should I do to cut the object and then light it Will she go away? is the object. what light will it pass through object? she won't do it. So Let's change the diagram a little bit here. Because of this it gets complicated. We What do you do? We are working in this direction like this Let's cast a light ray. Where? This In direction. and this is the direction This is the direction of the center of curvature. That means the light hits here. and the same path what does she do on this? It reflects. And like this it passes through the center of curvature. Ok? So its diagram is something like this Will come from. Now understand carefully. It collided and Pass it back through the center of curvature.

30:04 Now these two light rays should go away Have been. That means they will never be found. so this Where do you look if you are in the real world If you cannot meet them then where can you meet them? Virtual In the world. So now we'll see that these two Light Rays goes somewhere in the virtual world We will create an image here. and images How will it be? Image created on the right side Is. So how will it be? Virtual and erect. And How will it be? highly enlarged The image will be there. Ok? These ray diagrams It is important and it is virtual and erect it occurs. Remember this also. same case How is your image created there? Virtual and erect. Do you understand this I? Tell me quickly in the chat. quickly tell from. Is it clear? very nice. Very Isn't it great? Yes. Yes. No one will write That ray diagram is cross, right? The Candle G The love story of. Right? No comments

30:49 Will do it. No one will comment. better than this I remember a lot of people kept asking me Is that Bhaiya the opposite gender distraction It is happening. What to do? The boys ask me Yes, opposite gender distraction is happening. What to do? son put dp Take. The day your face was revealed to him There is no distraction after that anyway will be. There is no need for any message from the other side. Correct Is? You can put your DP. Come. Did you understand it? Read it silently. Look, there were six cases. I know your case in these six cases I have lost my mind. But now I'll give you I will show you. Ila magic. What is magic? See. Now I will show you a magic trick, son. Counting Here comes one two's four. 4 2 that one No counting, look at the counting 1 2 3 4 You just keep counting, write one here what should i write it is one na accept this position infinity okay then write to okay then

31:37 Write three on it, then write four, then this Write five on this and then write this counting on this So, everybody knows it. Now do this counting in reverse Take. Everyone knows how to count backwards. Here Start with it. one two three below it Four and below it, five. where is bhaiya six Went? Forget about Six for now. See What is this? This is PK trick. all re There is a trick to remember the diagram. Now look at what do you want to see? number one whenever Your object will be on one and the image will be on one It will be made. Object at infinity. where is the image Is it being made? See for yourself. Where is the forest? Focus on. Where is the forest? Focus on. Where will the image be created? Focus on. Number two. Whenever the object is your If the center of curvature is beyond then where will the image be will it be made? On number two. where is number two? Between C and F. Ok? When it will be on three

32:24 So where is the image being created? On three. See for yourself. When there is four pay then where is the image being formed? Beyond Sea is being made. When there will be five pay That means if it is on focus then where will the image be formed? Five. Five means infinity. Infinity Pay. And the sixth case is a very different case. that is You will have to remember it. in the sixth which The image that is created is created on this side. Isn't it? Eyla Magic. So this is the trick that we By utilizing these you can remember such easy things. Let's take it. Ok? is it clear son? Correct Is? So look at your updated NCERT. This is a PDF. Now look at this carefully. here what i was telling you at f where But is the image created? It is made on infinity. And It is clearly written that the image would not be Formed. That means we are not even the nature of the image Can you tell me? And we're not even sure about the size of the image

33:10 can you tell me because the image will not be created Actually. Infinite means we are very far away I can't even tell you. Ok? so this is updated It is NCERT so I am telling you. ok sir. Let's move ahead. Let's move ahead. come now has been a big importance means that much Not Important: The Uses of Concave Mirrors what are they? Questions arise on this too. Look brother what is a concave mirror? a type Converging Mirror of. What? Converting Joe That makes things bigger. Isn't it? Is No? Like the one that comes in Doraemon, Big light. Just like that, it makes things bigger Is. So this is how you remember Doraemon's Big light. Ok? Who has seen Doraemon? By the way? You must have seen it. By the way, I too have I have seen it in my childhood, friend. so you You must have seen it too. Ok? Look Concave The mirror magnifies things. So like shaving, beard etc. You would need something a little bigger in it This is your image. So this is why shaving mirrors Are the girls inside applying make-up?

33:55 Are. Isn't it? If you are applying makeup then do that too You need something a little bigger. then concave mirror when We need to magnify things, make them bigger It is useful when it has to be done. other than that Solar furnace variant. What is a solar furnace There is a device which is capable of measuring the sun's rays. Points all the light at one spot. Concentrates. so which one is there Is a mirror used? Remember which one? Concave Mirror. This is also important Headlight. So look at your cars There is a headlight, right? So what is that? The headlights of vehicles are also concave it occurs. Look, it is like a cave. It is like a concave mirror. Ok? So the bulb that is there in it, you know that bulb where does it happen? Suppose this is a bulb. Suppose this is a bulb. do you know where the bulb is it occurs? The bulb is situated near the focus. That means this bulb is exactly in focus It is close by. Where? right in focus

34:41 The bulb is nearby. put it there goes. very close to the focus of this mirror The bulb is placed so that we can see things at a distance Could see it. Ok? very nice. Very Excellent. Let us go. Oh brother which car was this? Which car is this? Wow. looking very nice It has been happening. ok sir. will answer the question. Megha Oh my God. Where is Megha going? Megha She is going to the dentist. ok sir. Megha visited a dentist in her clinic. She observed that a dentist was holding an Instrument fitted with a mirror. state the The nature of this mirror and reasons for its use in the Instrument used by dentist. Which ones What type of mirror will a dentist use? The dentist needs to look inside your teeth Brother. So he needs a bigger image. of large image Use concave mirror only for this It is done. The question is asking why? Why Concave Mirror? Because brother Concave

35:26 Mirror magnifies the image of your teeth. So That dentist bhaiya will be able to see and tell will find it. There is a cavity in your tooth, son. Is No? well dentists all that You ask me to get it done. what do you say These people? Root canal. get a root canal done Canal. Isn't it? My once little worm It got stuck in my teeth. Went to the dentist. Get a root canal done. Root canal? I said hey Don't get a root canal done. Just do the filling. Is No? Let's go to the next question. a student uses a Concave Mirror to Burn a Paper by Focusing sunlight identify the position where the paper Must be placed. what are you saying? this is it Your Concave Mirror. Ok? and that brother I have taken a paper and on that paper, Wants to concentrate all the light. Well the sun is very far away. then light from the sun How are you, son? Parallel comes parallel.

36:13 So tell me where can I find parallel light? Are? So it is obvious that it will be found on focus Are. So where should we keep that paper? Near the focus of that mirror. Where? that mirror near the focus of. and this is the correct answer It is going to happen. Ok? Let's go sir. Very Excellent. I understood even this much. All good. Let's see the next question at the top of your screen. Son, here it is tiding tiding tiding. Let us go. A Science teacher. Oho, I talked about PK bhaiya. Wow friend PK bhaiya come. placed a candle In front of concave mirror. Student observed the nature size and the position of The image by changing the position. Question Let's read. What type of image is formed When the object is placed at the center Of curvature? See what I did? I Candle G to Candle G to Concave

36:59 Placed the mirror at different positions. first question that when I put the candle at the center of If I kept it on a curvature then where would the image be formed? Beans beans beans. It is made at the center of curvature Was. How was she made? It used to be real. Inverted It was made. very nice. what will be the The nature and size of the image when the candle is Placed between pole and focus? Last Case Whenever we place a point between the pole and focus When we place the object, the image that is formed It becomes virtual, it becomes erect and It becomes bigger, it becomes magnified. Let us go which type of mirror always forms a Virtual Image? Variant question son. Mark the star. Do you know which one is such Image? Which is the mirror that is virtual And it will create a diminished i.e. smaller image. Say Let me tell you Convex. because concave mirror What exists doesn't create a virtual image every time.

37:45 He makes it in a single case. While we just now Read further which convex will be yours How will he always make a convex mirror? Will create a virtual image and a smaller image. next Why are concave mirrors used in torches? Where in the torch or headlights and why? Are they used? because what is their job It happens? Tell. What is their job? Their job is to magnify. Okay, that's great. All of these There were questions and these are all of yours There were answers. Let's ask one more question. Then Moving quickly towards the convex mirror Are. Tell me its answer. Come on brother who will do it got this question? It is not a very easy question I will tell you. This is a question of a good level. Question what did I say? We need to look at the data. These What is data? We didn't see a concave mirror I have used it. Who have you used it? Concave To the mirror. and means different concave mirrors Are. Isn't it? There are three different concave mirrors. One is A, one is B, one is C. Ok? So

38:31 The focal length of a concave mirror is 20, the One is 15, one is 30. and we have objects are kept at different locations. Isn't it? Separately with all three mirrors. Now the question what am I saying? in which of the above cases will the mirror form a diminished Image? That is, in which of these cases Will your image always remain small? Now in this You don't have to do the calculations. You just have to I have to see it. Look, the focal length is 20 and Where is the object? Say 45 penny. i.e Where is the object placed? Say. well, if the focal length is 20, then the center of Where will the curvature be? center of curvature Its double. That means it will be at 40. Yes or no? Yes or no? Absolutely. That is, we have created an object is kept beyond center of curvature. Memory Do beyond center of curvature. Isn't it? This C It is also placed behind. So whenever we

39:18 if we kept θ beside center of curvature then Tell me, how was the image created? very small image It was made. Isn't it? So that means in this case Your image in case number one She will be small, son. She will always be small. Let's go a lot Excellent. Let's move ahead. List Two Properties Of the image formed in case two. Case Two What kind of image is being formed inside? Let's see. Case The focal length of the toy is 15 and the object is We took 30 cm. It is kept on. Look Double Exactly double. That is, we have It is placed at the center of curvature. And whenever we used to place the object at the center of curvature Son, what would have happened? very nice. Beans The image was created. Same Size Real Inverted and What was the size? the image would be exactly the same Was. Okay, that's right. Last question. What is the nature and the size of the image formed

40:03 Bye Mirror C? It is like a mirror which is very My son is special. know why? Its focal The length is 30 but we have placed the object at 20 It has been kept. That is, we have placed the object beid means between between f and p its The object is placed in the middle. Isn't it? Because how much is that? This is 30. But I kept it at 20 only. Look counting It starts from here, son. this zero It happens. So we have kept it at 20. While the focal Where was the length? 30 p.a. So how is the image will it be made? Special Case Virtual Erect You know the magnified ray diagram Is. This ray diagram is very important Son. Ok? Come on let's move ahead quickly From. Now let's talk about convex mirror. Convex mirror, I didn't ask for it in the paper I am leaving but I will still tell you. very easy Is. It is very simple. Dekho Convex Mirror There are only two cases of this. There are no six cases. Two

40:50 it is just that. Very simple. The first case is either Candle ji, you are on infinity. Second case either at any point other than infinity Are. See if there are candles on infinity Yes. Assume it is very far away. so whenever from a distance Tell me what happens when the light comes on? What It happens? It appears to pass through focus. Where will the image be created? Focus on. how will it be? It will become small. The first one will be diminished. Point The size will be made. and whenever the image is on the right side If it becomes possible then remember the difference between virtual and virtual Big brother son et. what's the matter, what's the matter Is. The second case can be any distance anywhere The candle is either here or there It doesn't make any difference. What would you do? First Put light rate, send it far away and where will you get it from

41:36 will he do it? Will pass with focus. very nice. Now apply another rule. Which rule will you apply? Who He also comes and goes at the same angle. Correct Is? So track it now. Virtual World Go in. So where is the image being created? here at It is being made. That is, if any finite If you keep the object at a distance then The image will always be formed between p and f. Where? Between p and f. how is the image Will you make it, son? It will become virtual, it will become erect And a smaller image will be created. how will it be? Small And This is what tells us that the convex A mirror will always create a smaller image. not big I can make it. Never never. will make it diminish, He will make it smaller. This is a small light. These Big There is no light brother. This is a small light. This is its work. ok sir? this table i Let me show you a table like this Which you can read later. and this one What is the comparison between? Concave and

42:22 About convex which I have already told you It has been kept. Look, I know it now that I see You must be feeling like this brother so many How will things go? How will I remember it? Buddy Don't you have confidence? Have confidence in yourself friend. Isn't it? If If you want to do something in life then all things Will have to leave it. either you do all the things Leave it. As many as you want WhatsApp, Facebook, leave all this. dreaming either Leave it. You have the option. either that Either give up or stop dreaming. Decision It's yours. You will have to work hard. Come. What are the good uses of convex mirrors Of? So convex mirror is like this small light Like. That means it makes the image smaller. So its biggest use is your rare Inside View Mirrors. look in the car no, do you look in such a way from the side that behind Who is it? So do you know what's inside that mirror?

43:08 It happens? inside the rear view mirror It is a convex mirror which gives you a faraway view Shows it. Gives a wider view. Isn't it? So First is its rear view. The next one is Security cameras. As much as your do you have security cameras or They wouldn't be there. If you went to a hotel, then not one If only someone would peek like this. Have you seen that? Yes. So whoever it is, remember his name. I am not able to understand it. He who happens to be What happens inside you? Convex Mirror It happens. what happens son? Convex There is a mirror. Is it clear? Quick Tell me quickly. very nice. Correct? So you read the uses of convex mirror also. Also read the uses of concave mirror. now coming are subcent. Sign conventions. what son? Sign conventions. This is very important. Come closer. This is a topic that Numericals are bound to come and if you If you learn it today then the lens will also have the same color. what will come? The beans will come. Look no matter what Be it a mirror or a lens. I don't care Would have fallen. What doesn't matter? I don't care

43:54 Would have fallen. Be it a mirror or a lens. tell me today I have been. whatever is on the left It will always be negative. Whatever is on the right It will always be positive. whatever the thing It must be up there, right? She will be positive. whatever The thing that is below will be negative. that's over. Tata bye-bye. Goodbye. This is what the sign is about. That's it. Look, let's understand some terms. U what It happens? U is the distance of the object. Isn't it? How far away is the object? Values ​​such as I'll put my candle here Gave. Isn't it? So this is the distance from the pole What will this be called? This will be called U. Ok? What will you call it, son? It will be called U. Attention You can understand from this. It is important. Ok? V What happens? v is the image distance. From where? From the pole. So assume the image from the pole It is being made here. So this will be the distance This will become V. And there is one more thing called F. F

44:39 What is? Everyone knows the focal length. now then I have read it so many times. Ok? So these three There are things. You should know this. V.U.F. sign convention in full, that's it Is. I told you. come quickly now Whose side are we on? Towards some formulas. Like there is a mirror formula. big cute little Is. He is like a tiny little kid. The mirror formula is That means 1 / v + 1 / u = 1 / f. whether Whether it is a concave mirror or a convex mirror, Whatever happens. Remember this. this mirror formula It will remain the same. Ok? besides that one more The thing is magnification. Now you will speak Brother, what is magnification? So look Don't take too much tension. Magnification What is? Read the definition. refers to the Ratio of the height of an image to the height of an object. That means there is a ratio. These What is? Ratio. We will denote this by a small m

45:25 Let us represent you. what is its formula It happens? height of image divided by height of Object. that it. Isn't it? Height of the image and the height of the object. That magnification. It has another flower. It has another flower. There's another flower in the mirror's case. that Is -V / U. Remember minus comes. What Are you coming son? The minus comes. - V / U of this This is the second formula. Just understand this much. Ok? So what is magnification? ratio of the Height of image by height of the object. And Another formula is -v / U. What are V and U? Is? You know it. Ok? Now I I will move on to numerical. But before that you One thing has to be understood that magnetism tells What is? Suppose your magnification is up -3. What does it mean? whenever If the magnification value comes to minus then Remember your image is real and bigger than real brother who? Inverted. very nice. Good

46:10 If now this is the sum of minus and positive signs The meaning is different. Meaning of the minus sign what happens son? Meaning of the minus sign What happens? If there is +3 here. of the minuses Meaning real inverted. and if it comes positive Magnetization means virtual. Virtual and Erect, the older brother of Virtual. Ok? Minus and positive mean real Virtual. Now the values ​​next to it are Like there is three here. what does three mean Is? that the image that has been created is three times The size is . i.e. forget the positive and the negative Go. He only tells me virtual and erect Is. Isn't it? And Real Inverted tells us this. While these tell us the future values How big is the image that has been created. Good value If your magnification is 0.1 What does it mean? Minus means real Inverted. What does 0.1 mean? 0.1 of

46:56 This means that the image is made smaller. When the magnification is less than one then Can you understand what the image is like? It is small. Correct Is? If you don't understand it yet then use numerical We will solve it. It will become clear in that. Come Let's quickly come to the numericals. See Son, solve it. What is the question? a student Conducts an Activity Using a Flask Of a height of 15 cm. And a concave mirror. Ok? So what has he done? She has a I took the flask and stood in front of the concave mirror I have kept it. Flask means you can assume anything Take. And the height of that class is given to us. That is, we are given the height of the object which is is 15 cm. Ok? Now tell me yourself Should I take this positive or negative? We always keep the object straight. Above We keep it. I mean, what will it be like? Positive. Now This is a game of positive and negative, daughter Sara.

47:42 look he finds that the image formed is 45 cm In Height and Real. what did you say? Real. Whenever your image becomes real, it is real Who is the elder brother of? Upside down inverted. and when also the image will be upside down, so I will tell the height of image What should I say? Positive or negative? Say Negative. Why? Why? Why? Why? Why? Because the opposite image was formed. whatever Thing down negative which is ok up top. Us Do you want to tell me what will be the magnetism? now then There is nothing left in the question. height of Image Divided by Height of Object That Is -3. So will you get the answer, how much will you get? -3. Let us go very nice. Done. Such questions come up. Ahead coming. Let's look at another question. this is big This is an easy question. a student wants to Obtain an erect image using a concave

48:28 Mirror. There is a concave mirror and it is erected An image has to be created. Whose brother was erect? Of the virtual. i.e. create a virtual image With the help of concave mirror. How can it be made? Where to place the object? we know The focal length of the mirror is 10 Cm. you know if I concave I keep the focus in the mirror between the pole and the Only then the image of the object becomes virtual. Yes or no? Do you know it or not? Known Is. And what is the focal length? 10 cm So If I move the object 10 cm. fewer I will keep it anywhere. Isn't it? 10 cm less than nine, eight, seven, any If yes, a virtual image will be created. So its The answer will be less than 10 cm. What will come Son? Less than 10 cm very nice. Very good son. This also became clear. ok sir. And move on to the question. next

49:13 Question for ₹1 Crore on your screen. tiding tiding tiding here it is. Come on. 5 Cm. Tall object. Keep writing, son. First of all write down the givens. Isn't it? how much given Is? What is the height of the given object? See for yourself. 5 cm ok sir. 1 minute. So What is looking at my face? the question itself This should not be solved through. prashant bhaiya he is I will get it done. Okay, solve it yourself. Ambulatory He is looking at my face. Came. at a distance 10 cm From a convex mirror. Who What mirror is given? Convex. Now comes a The most important game. and you are the star Mark it and write it down in your notes too. Tell me one thing. Which mirror is this? Tell. Concave? Which mirror is this? Convex. Well, the focal length of the concave mirror is Where is the length? Does it happen on this side?

49:59 It definitely happens. then its focal length will it be positive or negative? whatever the thing That negative one is on the left side. But Where is the focal length of a convex? Memory Do it, I have read the diagram on this side. That is, its focal length will always be How will it be? It will be positive. and this is to understand The game. Always remember that concave The focal length of the mirror is negative. Whereas Its negative for convex its positive. Now let us come back to the question. We are given the height of the object. Us Distance is given of the object. Good Where is the object always kept? whether Any mirror. Whether it's a mirror or There should be another mirror. The object is always placed on the left Keep it on the side. Yes and no. Yes and no. Absolutely. So the distance to the object is, what will be the u? Negative. always in

50:45 What will always be the any question? Negative. So how much is given? -10 cm Very Excellent. from a convex mirror of focal Length 15 cm. Well, convex mirror's What is focal length? I just told you fool Boy. ok fool i am speaking with love Am. Don't take that much load. Isn't it? Our It's something in between. How did you say fool? I kept on speaking. Ok? What do you have to tell us? We have to tell you the position. That is to tell us v Is. v Isn't it? The position of the image has to be specified. The nature of the image has to be described. I have to tell you the size. See what has to be done? first thing v I will calculate it. How will you calculate v? I just told you friend. what are you talking about friend? I just told you. What did I just tell you? Now! I told you. Say. This formula. is this Does everyone remember the formula? very nice. Now You keep applying. Now there is basic math. 1 /v We have to remove it. what is u? -10 AA

51:31 Went. Ok? And what is the value of f? very nice. transfer it here Two. So the value of 1/v will be 1/15 +

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