 Good evening guys. Am I audible quickly drop in a Y or N good evening on the 25th May Good good good good good. And you know the procedure good. That's really beautiful. Yeah So, yes today we will be inaugurating the chapter of light In the sentiment, you know pretty obvious as we had odd five to six episodes of Electricity so light being a bit lendier chapter will have more versions as well But yes, we will try to close it in five episodes Right numericals. Yeah, they are any way the integral part of the chapter. Okay. So yes We will be having the numericals as well. But yes today being the first session Right or not and the we haven't yet completed the chapter It was very difficult to generate numericals out of it. Okay, so You might find some similar numericals as well. But yes, your learning output will be tested If you will make them correct, right? You are deriving a reflection formula or mirror formula again Gupta two mirrors. What the ap Thingy Okay. Good. Good. Good. Good. Good. Good. Good. Today we have kept only plain one of plain mirrors So today you will not have to use that Position of the 19th image and all that. Okay, so That's not required Gupta. It's okay Actually says like oh, thank god Is my voice clear no hindrance and all Good, Surya. Where is Anruth? I know the idea. Where are you? But I don't know why but I am not getting very much in deal with the dark mode. What I mean? Well, I don't know why it's the primary reason is Like the sentiment alone one day There's a passport. I'm not liking the sentiment. Uh, the logo Insignia of the academy on the Dark mode version So that is the primary reason I'm not going for dark mode. I'll tell you is very genuine Sentiment army sentiment color sentiment. Academy is local. Sorry The insignia of sentiment. I've seen PPT by Tushar I and Uh, Prabhata as well. I was not liking It appears clear good No, no, no, no, at least to me. It's not very good. As you are suggesting. Yes, I'll also put efforts on That I'll see if that can be done Okay, chalo fine. I'll see better. I tried. It's not the case that I did not try it I really tried genuinely tried but couldn't find it. Sorry. Sorry any problem any genuine problem with the Bright mode I know I understand you guys are having a Long screen time and all that right so yeah, but I think can bring it win that Okay, chalo anyway good time to start Uh, either it will be zero five Or six zero zero five at the clock or six zero over the logins. It will be triggered whichever happens first. Okay Shaw chalo fine 58 59 58 59 is happening And zero five happened first Look at the question read and respond 8 hour is your screen time surya But hey Relax and respond to answers by now I don't think so that the question can even be read in that duration when you responded So guys if you are guessing Sorry Mongara what happened refresh bit up because people are already responding to it 7 7 5 9 5 0 is the code Relax mongara. You might miss one question. It's okay Relax Deviation total deviation deviation is the change in the path So it will make a complete cycle. Don't just Okay, 57 people have already responded to it. I guess I've given some extra duration 58 people 59 Then it should show that everyone has responded. Oh, we already have sir. There was Heavy current fluctuation yesterday at persuasion another many appliances got fried at home Fried like Okay, this is sad This is sad to look at the answer It is really sad. Let me see how many people are small like maximum number of people have gone for either alpha or bravo Okay, and delta as of now being the right answer. This is the question Now there there's a small variation Now But you guys subtracted it from 180. I know you know relax relax. Oh alisha Excellent work No, understand this. It's it's pretty simple. No problem. No problem. Relax. I'll explain See what you did. I I was aware about that. Okay, suppose there is a simple plane mirror And there is an incident radiation over on it So it wanted to go straight But because of the properties of the mirror it got reflected this way Yes or no so So now this is the deviation right most of you have calculated this way Okay, but there's a problem. There's a variation here It is a pair of two mirrors, right or not So and when it happens the light Will go all the way Like this Okay So the total cycle to be covered by light in the case of two mirrors is 360 degree Hence the formula to be used is 360 minus 2 theta 360 minus 2 theta Is to what being the answer gi got it gi got it gi got it You guys are beautiful and you should know that I will okay, Meghana. I'll repeat Meghana, I guess you might be like through with this part. This part is clear deviation is 180 minus theta This part might be clear Meghana, right The code is I forgot I'll show you the screen in a while there on the road I'll not start before you come over there. Okay Okay Meghana is this part clear double seven five nine five zero Very good Okay, so theta is better angle of incidence So this is also going to be angle of incidence of total deviation is 180 minus 2 theta Yeah But here it will be 60 degree Yeah, this angle is the angle between the mirrors Okay You can't hear everyone else am I audible quickly why are in Yes Hmm. So then we should help out our dear friend Meghana Yes, dear in plain mirror. They will give you angle of incidence. Okay so Whereas In a combination in a pair of mirrors. They will give you the angle between the mirrors Okay Are you got it? Good. Good. So what happens? Yeah, exactly. No, but that's why I'm saying when there are mirrors the cycle to be covered by the radiation is 360 degree That is why 360 minus 2 theta Okay, if it is a single mirror the cycle to be covered by the radiation is 180 degree So 180 minus 2 theta Okay No problem. No problem. No problem. Relax quote, please quote, please quote, quote, quote, quote No, no dark mode Look at this beauty here In dark mode. I will not be able to It is given here. It will be given in the question 60 degree Exactly in our chair. That's what I'm saying in plain single mirror What will play the role is angle of incidence? Whereas in a pair of mirror what will play the role is the angle between the mirrors So, let's look at the leaderboard anyone. Anyway, only nine people have responded correctly to it So all those top 9s will be here Good our internet very good very good very good. Harshita very good very good very good Very good very good very good actually very good to all nine of you and All odd 60 people who are here Good Aniruddh, are you here? Aniruddh, are you here? I Promise you that I'll not start before you joining it. Please respond me over chat. I'll start. Okay, dear Here we go with the question number two. We'll have to move a bit faster. Thank you very much. Thank you very much Thank you very much Everyone else is at 10th position. This is a beautiful dialogue Aniket Gupta very good Same formula put the value get the answer same formula put the value get the answer Same formula put the value get the answer So, oh, oh, oh, I should not have a lot of this much duration Right, especially when I was aware that I will be explaining the same case Prior to this I shouldn't have allowed hundreds questions hundred seconds, right? I might have saved the time. Yeah, sorry. Sorry. Sorry, but yes We'll anyway save the time in explanation part of it. Yes or no By now almost everyone has already answered almost everyone say 60 minus 2 theta is equals to 180 So theta is equals to 90 degrees the answer Haha, what I said the answer Meghna Can you hear me now? Why aren't first Meghna? It's okay. Nadia. No problem And that's beautiful to see 47 people responding. Correct. Beautiful. Beautiful. Beautiful Beautiful. Beautiful. But yes, we have seen 61 people responding correct out of 62, right? Right remember the last September Where Surya and Meghna cried Good, who's the fastest one to respond and Neha is the fastest one to respond very good Neha very good very good very good So Good good good good good Very good. Here we go with the next question one two and boom I shouldn't have given 100 second for it. But yes, I know there are people who might need calculation Read it carefully. You might miss something Very good. Very good. Very good. Very good Then in this case we can test whether if everyone votes should it switch the slide by itself Oh Where did you got sat down my dear Surya? It will go double because it is not with respect to mirror I told you read it with respect to what with respect to mirror as the speed of object with respect to object Double the speed of object Okay Hey guys, have you seen the horror movie mirror? I don't know whether it was like explicit for minors. Yes, but yeah, that was a good creation Some good creation. I liked in horror guys same confusion, which is a very like this is showing me that you know You are confused is dangerous. But at least you are confused between right things not wrong things. Okay guys Good good. Okay, I'll explain I'll explain The first one small good good good And I'm explaining it for you dear This is done And this is here now, but see simple object mirror and image Object move one step toward the mirror image will move one step toward the mirror But actually the distance between object and image is decreased by double. Yes or no Ananya So if the speed of object is s Toward the mirror or mirror toward the object Then the speed of image toward the mirror will also be s. But if the speed of the image toward the object Speed of the image toward the object will be double office. Okay Should I derive it and all that or it's fine? Hey, Surya. Why are you deciding Ananya has the doubt let her decide this is the Or I see all of you as future Like big big leaders in whichever sector Okay The best quality of a leader is they Let people move leaders believe in collaboration not in competition Okay, this can be a quote. Okay Okay Collaborate Instead of competing Okay, no, it's not original. Yeah, I read it somewhere So nice. Good. Good. Good. Good See Don't confuse me There wasn't any need of Under the g stands for guest or Oh, oh, oh, okay. Okay. So generally it happens with mungara. Now it's happening with Anirudh Good very good. Congratulations collapse for Surya, but at its face You forgot to do minus one da Guys this was a like A quick revision question only right 360 by theta minus one 6 minus one Five being the right answer. Yes or no why or and no doubt. Yeah, please So, let's see the leaderboard 60 will be a circle 60 I can make no problem. It will be a like uh Got it arian Okay, I'll give you a hint. Uh I think it Better make a hexagon Make a hexagon You will have right or not From the center Yeah Surya code is double seven five nine five zero Uh from the center, uh, Aniket Gupta, you will be able to connect Six chord to six vertices on one such chord you have the object so 360 by theta minus one I'll tell you how I got it that day. I proved it for 90 degree, right? Where theta is greater than 180 degree So beta, how can this be possible? Shreya Shreya, sorry The capital s just cannibalize the small s so it came out as Shreya. Okay No, you will see See Beta 360 by 180 is two Two minus one is one But now if the denominator will be more than 180 degree Okay, you won't get two you will get one point something something right Minus one is point something you will see total image Yep good Next question Shreya's was the fastest one to respond to this. Shreya's is beautiful. You should know that I've learned this new dialogue from ninth graders, you know that you are beautiful. You should know this Be careful. Don't double everything is the hint to this question simple please And the beauty of this is that you guys are investing your time and solving it Good good and good Now I should have a tsunami of answers Hmm. It's coming in like small waves Remember the hint of this. Okay. Do not double everything Ah, Shreya. Congratulations to this boy Shreya for you, especially you are getting but beautiful. You should know it Gupta correct And I love you all here very good very good R&N and very good bache very good excellent Anand, very good Meghra very good very good very good very good Relax understand this mirror three centimeter object Yeah, no doubt image Another three yes or no Yeah If this is zero, this is plus three this is minus three just for you guys Okay, making it simple. Okay. This is origin zero There's plus three. This is minus three Yeah So now from the plane where the camera which is At a distance of 4.5 from the mirror. Okay Should be focused for a distance of 4.5 and 3 7.5 Anything easier than this You guys are beautiful. You should know it Let's look at the quick responders A good shuffle is going to take place Not a very great shuffle because this man R&N has led the game in the initial position to a great extent But now there is a good competition healthy competition between two people at least 4 4 4 4 which is between Nana and Prana very good very good healthy competition. Okay And here we go with the next one Akshit excellent to respond this most quickly. Okay excellent Take your time use Similar triangles you will get it You don't even need similar time. You will get it satisfied by congruent triangles only But yes, it will not be a 50 50 distribution. So yes similarity should proportionality will play a role But yes, congruency is the answer actually So beautiful hints I'm giving I should appreciate myself for this Thank you. I'm giving beautiful hints for simple questions I ignored No person is 1.8 meter tall also right who is 1.8 meter tall Like in the sense For them it is 10 centimeter only their forehead is also 10 centimeter wide I had in my schools think about an embarrassment In my class I had six four Chandra Kishore Surya Vanshi Very good aren't relax 30 people answering it right is good There is a man 180 meter 10 meter below it is the eyes Yeah Now the line of sight is there which line of sight is there This line of sight will equally divide two parts an engine angle Close to angle of reflection wire and wire and wire and wire Good, what is the remaining part? What is the remaining part? 160 We'll get divided into 80 and 80 So the minimum size of the Mirror is this part Yeah 10 plus 80 90 Okay, okay, okay. No problem. That's no problem. No problem. No problem. I'll also explain with a better figurative representation Okay Under service. This is the mirror Okay This is the man. Okay, so Here is the top here is the bottom So, so, so zero to 180 Yeah At 10 Yeah Eyes are there This will cover The angle of incidence is equals to angle of reflection 20 parts. Yes or no y or n y or n I am explaining that only there. Actually, I am explaining that But yes, I should also explain the real How this h by 2 came that is what I am explaining The remaining beta 160 10 plus 20 gone the remaining 160 So the minimum size of the mirror we need is this part Okay So if you do it to 80 the minimum size of the mirror required is h by 2 Okay Distance from the mirror will only beta c the focal length of a plane mirror is infinite So distance from the mirror don't be influencing your responses. Okay clear Always half half half the height Also, just like just just for the knowledge part of it suppose There is a wall. This is a wall to be seen There's a wall of height h to be seen in a mirror and you are Somewhere in between Somewhere in between In that case that this mirror should be h by 3 Remember this You can create the same diagram here as well You are not at the wall or don't say that that you are at the wall. Okay If you are somewhere in between then you will need h by 3. Okay That you remember it this this is like Again same diagram create Assignment if not, then we will have this discussion in our class. Okay No Make it try the same. I told you the figurative representation rn Try if not then class in the world Okay I'll give you a hint to use basic proportionality theorem. You will get it So on a side note, you will get the answer on the side What is the total number of questions? Ashleisha, okay, but the question cancer. I'll explain. Don't worry. Okay. This is the height of the person. Okay at 10 fine The eyes are there. So at the line of eyes Angle of incidence is equals to angle of reflection. So 10 up and 10 down 20 centimeters of the body are covered. Yes or no ashleisha What I said right now I said ki Uh, if you like you have to see something else behind you You have to see something else behind you like there's a wall And there's a mirror and you are somewhere in between you have to see this wall of height h Then you will need a mirror of h by 3 Okay Yeah, and for that I told key Similar type of proof will follow do it as an assignment. I know it will be It will not be received by everyone. So we can have a discussion on this in our lecture. Okay All correct. Okay Let's see the reader board and here we go Are in you missed it dear Pranav and Nana still having a tight competition between them Ganesh was the first one to respond to this congratulations dear I know the sign is Ha one two and here we go Just giving a hint if you guys know Intersection of sets you can easily get it anywhere by Application of normal logic you can get good good good good good good good good good There's still everyone hasn't responded I have to see Everyone has responded so the slide will change by itself Yeah, I know I know it happens. This is a good one aniket. It's like okay. Good. You went like that Why didn't add one bit? Why will anyone add one One extra image will be from whom the images will reduce because of intersection. No Good. Good. Good. Relax See okay, you know one thing That if it would have been one single pair Then the answer is this yes or no Yes or no why or any By we don't live in Ajeep sir design ka home. No our homes are symmetric So every wall to the other wall is 90 degree. Yes or no Don't tell me sir. No. No. This is not the case in my it's 110 in my home. No, please don't tell me that okay so by Good in that case understand There are three such pairs Between a and b it will be three between b and c it will be three between c and a also it is three But out of these three two are already occupied here. So only one will come So what other people did is Three to the power okay So minus two is also. Okay, or three plus three plus one is also. Okay, answer is seven Okay, Meghna. Okay dear no problem Meghna A b c all three are at 90 degree right or not Nandini You know that for a pair of two mirrors at 90 degree three images will be formed. Yes or no Understand this Okay For a and b three For b and c three for a and c also three But out of that the two images are already overlapped one by this and one by this So it will be three plus three plus one You guys are good Let's see the top scores by now By last question r a and dear friend of mine All right, what happened here? 9 20 and 9 16 quite a good score between pranav and naina namesh good jump and reaching to the top most Ganesh, uh couldn't respond to this fastest, but yes leading the show Very well good. Good. Good. Good. Good. Good. And here you go with the next question Gupta is 11th. Very good. Very good. Very good Like boom. All right, this one. Please show me that everyone has responded But you should know proper multiplication And you should not forget subtracting one Okay, sorry Sorry, sorry, sorry But okay one second. There is nothing like there is no binary operation like a division division is nothing but multiplication only You can't say the same for multiplication. That's why there are only two binary operations Edition and multiplication See and gupta might have consumed his time here Good. Good. Good. 42 people responding to it. Correct. Okay. Just to remind people like gupta that 5 multiplied by 72 will be 360 I'll see 5 minus 1 equal to 4. I'm overexcited So 7159 and 714 0. It's a beautiful mark of competition. Please guys if I'll go to mute you Yeah, good. Thank you Ganesh is also leading good show stress was the one to respond is for fastest. Good. Good. Good. Good. Good Hello ready for the next one Don't subtract one again from here. Here you have to add one. Okay Let's see how many of you make it wrong It's the Ulta question Guys 31 30 good good good good good good good good good good good good because it's confusing Okay. Okay. Okay. Okay. Okay. 47 people responding to it correctly. I don't think so. There is an explanation required Er or in Okay, I'll I'll keep this as a reminder for myself 120 degrees right Good very good. Very good. Very good. Let's see the leaderboard. Very good. Very good. Very good Ganesh missed it this time. What happened here? Where did you go made it wrong? You are playing really beautiful and stress is a good man Good tight competition of very few points of odd 40 For 40 or 30 going on between pranav and I forgot the name of the child. Sorry Really carefully don't like and then Yeah, only 30 points is like out of 1000 points for each question and I have given 100 seconds So minor difference of Three seconds, right? So close to hit the wrong answer So it was confusing only The next one is very easy See on is from outside is Konke Inside is good. Good. Good. Good beautiful Guys There was no explanation required for this We are here Now understand virtual image is possible only in convex and plane Plane will not make diminished image. So only convex mirror that might have been the approach Okay Next Concave can make virtual image. Okay, but are not diminished. It will magnify the object Okay, like the image outcome will be magnified if it is a virtual from a concave surface But a parabolic shape Instead of cutting it out from a sphere sharduli if you'll cut it out from a parabola And see concave or convex will just be decided by the side. It is polished right or not So other ones other people might have responded faster than you know Why why you are not moving that easy day easy quiz day Surya, you are responding correct only but others were also Consistently responding right Shares is maintaining the pace shares is beautiful Now this is tsunami of answer. Yeah, exactly. There's tsunami. Oh, I just now gave you the answer That concave can make virtual Your life is consistent Surya No comments We are not in lecture hall. We are in a gathering So here is Why is it not not everyone has responded yet? Anushka, please dear There are people who are having a Something else parallel to them, right? 34 people why 21 people confused confused like ananya Why the question is what all the above can produce a virtual image of them can produce better plane mirror is always virtual Convex mirror is always virtual concave mirror can also produce virtual image What is sad, Surya? It is sad that the people in the first place from the last are Yeah, okay. Couldn't read it. Well, I want to match the time also dear. So please One two and go to the leaderboard And we'll quickly finish the last two questions. Okay, then then you guys are doing good But the beauty is that there is a constant competition going on between pranav and nana Also to be noted that they had maintained such a great score that shreyas being responding fastest to the answers from consistently past Any four questions? Okay, is not able to beat them out Very good shreyas very good on the higher side to pranav and nana very good very good very good Next question I gave the answer there. I'm dumb. I'm dumb like I'm boom in the conversation. I have given the answer Please mute here if I'll go to mute all it will take the screen out Kumar sath yai hota hai aar baal focal length of a plane mirror is zero alpha Bravo is infinite Charlie is very less and delta is indefinite No problem relax and you get There are many words which are which got added into my language For for people like you Like because of people like you as others the last year's 9th grade kabaaj has Added too many things into my vocab Not they're not words. They're like just Not vocab. That's why I replace that. No, it's not like words and all very good very good very good 37 people answering it correct that mean Okay, pranav So to the gap and I guess nanal Oh Nine points and shreyas is doing excellent exactly shreyas is like boom abayato it is Aditya, please Indefinite means you can't predict it. It's not definite. He definitely it is going to be infinite Like infinite and it's it's predictable. No, it's definitely infinite Hey gupta is back or not gupta. You're back better. See gupta isn't here In physics only is happening to him. I'll have to have words within that Again the same thing the only thing you had to read was the last line Okay, relative to man or relative to mirror relative to mirror would have been 15 only but relative to man will be 30 Beautiful beautiful beautiful Let's see the leaderboard and do the last question Last question was who won the show Congratulations. So pranav from nana Naina that was the most beautiful Congratulations. I had That that like that would have been captured with the quickness. You said congratulations Good good clap for these kiddos. Very good. Very good. Very good. Very good. It's nice to grow up with you guys It's teaching me too many things literally Very good. Very good. Well played well played well played well played pranav well played nana and well played to this man also stress for the consistency he has shown today very good Rn tender Between us he was also a lead scorer very good aren Okay, dear if you guys want it, I can send I can send out no problem. Okay Sure. Sure. I'll I'll do that. Okay Surya is like Someone should feel my pain too. Congratulations to who were static wherever they were. Okay Questions I always send beta you will find all my ppt is uploaded in moxa You can check I make them for the standards of moxa. Okay So thank you very much guys. Bye. Bye. Bye. Bye. Take care. Well played Good show you guys are getting beautiful day by day Thank you very much. Bye. Bye. Bye. Bye. Take care Take care. Bye