 is the screen visible is the screen visible good so here's the code 35363 quickly 35363 good good good good good good good 35363 is the code okay just a quick recap of what we are going to use and implement today right a quick grasp okay of what we are going to use and implement today fine so we are going to use point number one the mirror formula 1 upon f is equal to 1 upon v plus 1 upon u where v stands for the distance of the image u stands for the distance of the object and f stands for the focal length okay please mute please mute guys please mute keep yourself over mute thank you thank you okay focal image and object okay there exists something called as magnification magnification is denoted by m which is equal to height of the image upon height of object output by input kind of that okay so the formula for magnification is height of the image upon height of the object which is also equal to minus v by u minus of image distance by object distance clear these are the two primary formulae which we are going to implement today beyond that yes general properties of spherical mirrors will be utilized okay and things will be proceeding sure sure sure no lens no lens we are not into refraction we are only into reflection today okay Aniket no conceptual questions are also there in between okay and at times which in numericals are also blended with like what we call it as concepts okay good good good good good good good are four ready are four ready are four ready good good good good 58 people are here okay okay okay okay okay let's go 803 is the time let's start 159 people are here okay 804 let's start 60 people are here very good very good very good very good very good thank you Aryan thank you very much relax and respond. Aditya what happened? Thank you Disha. Thank you. Thank you. Thank you. Thank you. What Gupta? What happened? Got confused between R and F right? CNF, R and F type thing yeah? Okay. Okay. Okay. Okay. No problem. Relax. Relax. Aditya relax. No problem. Okay. Okay. Okay. Okay. I haven't seen the user side of it. Okay. 23 people got it right. Sure. So for pretty obvious reason clarification will be required right? Okay. So what is the scenario? An object 5 centimeter tall height of the object is given as 5 centimeter is placed 1 meter from a concave spherical mirror object distance is 100 centimeter as it is in front of a concave mirror and it is object distance it will be counted as negative. Y or N which has a radius of curvature of 20. Now C is equal to 20. So F will be equal to 10 centimeter. It is of concave mirror. So it is going to be negative. Okay. 1 upon F is equal to 1 upon V. We don't know. Plus 1 upon U. Okay. Solving it what will you get quickly? Minus 1 by 10 plus 1 by 100 is equal to 1 by V. LCM is 100. Good. Minus 10 plus 9. Yes or no? Okay. Sure. 1 by V. So from here we have V is equal to minus 100 by 9. Okay. The size of the image is we know that height of the image upon height of the object is equals to minus V by U. Okay. It will be an inverted image. Okay. What is the size? Will be equal to 5 by 9. So decimal conversion please. Okay. Okay. Okay. Okay. Good good good good good good good. Come on. Next question but not here. Okay. But before that the leader board. But you in case of... because you know in mirror policy side is positive and non-police side is negative by sign conventions. Come on. Hitting it the fastest. Very good very good very good. Tabishe is also here. Akshet is also here. here alisha is also here very good very good very good let's look at the next question ready and here we go not left and right side aslesha beta because in case of mirror it is about polished and non-polished side check what's up mongara if I'll check what's up then I'll not be able to see the chats oh this is how it appears ABC leader sorry sorry sorry sorry sorry sorry so then I won't be using it aslesha got it the polish and non-polished side okay so last six seconds 64 people have answered that's beautiful let's see how many of you are right or wrong I hope for a good number of rights oh beautiful beautiful beautiful beautiful beautiful no problem that's you can refresh and come back no problem no problem that's you can refresh you can come back your score will be maintained I guess there is a risk huh congratulations Surya okay er explanation required very good making a very good very good very good no I never wanted any are okay only those friend of mine who need an explanation so it's should send okay the focal length of a concave mirror is 50 okay where an object be placed so that its image is two times and inverted okay okay okay okay okay hmm now 50 50 50 50 50 yeah 1 upon negative 50 is equal to 1 upon v plus 1 upon you oh there are two variables is there any indirect information given is there any indirect information given is there any indirect information given yes exactly height of image upon height of object is 1 by 2 okay now they are inverted minus v by u they are inverted it mean both the v and u will be on the same side both the v and u will be on the same side why or n why or n why or n why or n you who good now from here we can substitute sir is it height of image by height of object 2 not 1 by 2 where an object be placed so that its image is two times sorry sorry sorry sorry sorry sorry thank you very much thank you very much are and you saved a lot of time thank you very much thank you very much thank you very much are in okay so images two times and inverted clear fine both are on the same side both are on the same side because of the word inverted if this would have been an erect case then the image will be like this the object will be like this right so we are not talking about this case we are talking about this case okay from here we can substitute u is equals to minus v by 2 or v is equals to minus 2 u 1 upon minus 2 u plus 1 upon u is equals to 1 upon negative 50 okay so quickly solve 2 u is the LCM 2 minus 1 is 1 is equals to 1 upon negative 50 u is equal to minus 50 by 2 the focal length of economy where an object be placed so that its image is two times the inverted excuse me sir yes dear sir this M should also be negative because it's inverted image it should be minus repeat the last we will be not minus 2 got it got it got it we will come over there one second Anna so got you got you relax thank you thank you very much now from here we are getting the answer as minus 25 this is what happens when you go for this case clear so please mute please mute please mute please mute please mute fine this is what happens when you go for this case it tells you that it will be placed between focal point and pole 25 clear now our case is inverted and that is where you will go for that the height of image and height of object clear so should be of opposite side object is like this image is like this so one has to be counted as positive and the other one has to be counted as negative and that will give you a straight lead this will become plus ok so and then you have your answer as 1 by negative 50 is equal to 2 u 2 plus 1 3 25 u 25 75 now 5 was this question in NTSC where I think and a concept is required a question is required to be solved in odd 50 seconds ok exactly I'll come there that's what clear it has to be deal with the proportion guys clear if you look into the proportion you will get your answer absolutely right and within the very first blink if you guys have analyzed the pattern because in further questions you will need it if you guys have analyzed the pattern as we move toward the image till focal point ok the image remains real and inverted but it keeps on increasing diminished when infinity then comes thola sabada then comes at C equal then comes between F and C greater right or not so that proportion helps you a lot clear so remember that that will lead you to the answer faster than anything else clear clear clear clear clear job next question and before that the leader boat at the seven people answered it right and that to in a good time common again 993 that's good but he is still not the fastest he is still the fastest very good very good very good very good very good very good very good job next question and here we go radius of curvature now is 25 distance is 40 the size of the image should be 11 people have already responded by the time I ended reading the question very good very good very good very good very good good good people are investing their time calculating and responding that's beautiful no problem mungara no problem an object of size 7.5 is placed in front of a convex mirror convex is an important term over here okay at a distance of 40 centimeter the size of the image should be mungara timing hello good good good good good times up times up times up is mute is mute please mute 32 people answering it right and it's muted chalo for pretty obvious reason explanation will be required an object again same same logic same principle this is a convex mirror it's focal length another mute thank you this is a convex mirror it's focal length will be positive radius of curvature is given as 25 so the focal length will be 2 by 25 why are and why are and why are and is equals to 1 upon v is not given 1 upon u is given okay object distance in any scenario is negative from here we can get the value of v quickly 2 by 25 plus 1 by 40 if you want we can go I like this as well 80 plus 25 is 105 okay sure fine now actually you have also cancelled it okay okay fine 5 to 1 here 5 to 100 good chalo in that case which a what is the height of image upon height of object equal to minus v what is v v is positive 200 by 21 by you what is you minus 40 okay height of object will get multiplied and you will have your answer yeah 5 into 7.5 by 21 quickly quickly quickly quickly quickly so 32 people got it right let's look at the leaderboard again magical 991 good good good good good good good good good good good good good question again make the okay here's a question which is no no no no hacks yeah turn you there why aren't quickly over the chart yes yes yes all good no problem no problem no problem nothing is impossible he might have got the answer ki chalo then relax no problem yeah the image found by a convex mirror of focal length 30 centimeter is a quarter of the size of the object so image is smaller the mirror is convex the distance of the object from the mirror is now we should get good number of right answers no problem no problem akshit relax relax relax relax relax good good memory congratulations I hope it is answering correct huh this is the like consecutively fourth question or like the just first or second question and the oh dax because for others it is showing so I cannot predict what might be the cause of problem okay from the server because why will the server cheat only you oh the time is over and 31 people answered it right the image found by a convex mirror of focal length 30 is a quarter of the size of the object height of image is one by four height of the object it's a convex mirror so both the object and image are erect okay the distance of the object from the mirror is if you have to calculate you this is equal to height of the image upon height of the object is one by four and this is equal to and this is equal to minus V by you one upon V plus one upon you you have to calculate what distance of the object you will keep you and eliminate which is equal to minus you by four got it gi gi gi gi I got it good good good good good good good good especially those friends of mine who have not got it right in the first chance okay the reasons can be miscellaneous okay now I think it's a serious time to talk to the service providers yeah if it is only Mungara I can be happy that okay Mungara is a cruel chap it can happen to him right karma comes back come on my dear friend no nothing that Mungara is a sweet chap yeah Neha was the fastest but Neha was the fastest Neha all good good good good good good good let's see let's understand okay relax relax relax exactly pay respect a boy stands straight I read boys stand straight and there are six responses a boy stands straight in front of a mirror at a distance of 30 centimeter now this is a possible one nothing man nothing exists like plano convex in mirror it exists in lenses okay good no explanation required I guess are for required only people who those who need are for required chalo good good good good good good good good next leader board are they okay we can talk no problem let man did not get this answer no problem oops a straight dropped a straight drop of four questions for rank sorry no problem no problem woman you will get it back good good you were playing good dear you were really playing good Pranav is there Disha is here Srishti is also here Ganesh is here our intended was the first fastest one to respond I have seen RN is excellent in responding the conceptual question his concepts are really good here I appreciate you are in whenever a conceptual question come this name appears good RN congratulations dear appreciate very good chalo for Aditya oops neha please come back please come back a boy standing straight number touchy 30 centimeter if the image is equal in size then plain equal not sign plain gone now the image is erect erect means it can be one case of corner cave and all cases of convex but in that one case of concave it is magnified image right or not not one-fifth of the height of the object clear that's why the only answer is convex clear clear clear clear clear clear good good good nothing good Pranav good RN look at the next question no no no no no but a mirror is a single surface mirror is not a combination of two so it can be plano and convex okay lens is a combination of two surfaces so it has to be concave concave convex convex plane convex plane concave like that okay the radius of curvature is 40 okay don't confuse it Mungara is like 1.3 seconds radius of curvature of a concave mirror is 40 centimeter and it is giving lessons to people better 12 questions no 14 I guess I forgot 12 or 14 28 people got it right but there is a huge chunk of people who got it wrong no problem look here the radius of curvature is 40 that means focal length is 20 it's a which type of mirror it is a which type of mirror it is a which type of mirror concave mirror so minus 20 yes or no it will take time up and down okay 1 upon V plus 1 upon U now in the case of a concave mirror okay so of focal length 20 if you check the options if you will check the options if you will check the options my dear friend if you will check the options my dear friend you will find they all are the cases of inverted image why aren't good good good that is giving you direction that minus V by U is that the size of the image is twice minus 2 so you have the answer with you okay 2 minus 1 is 1 next question Pranav Pranav playing good Tamil 987 is a good score now 888 for our dear friend Pranav oh Tamil again jumping up good good good good good good good good Gyanish is there the Tamil is good at numericals that's what is being proved by this hey Aditya Tamil is good Tamil is doing good at numericals good good good good good good good let's see next question like 5000 in all points like big big big scores you guys are a convex mirror has a focal length F very straight no time consuming okay and you get it from red diagram are in that is exactly what what you should not do read a wrong thing in the question a convex and concave are oh people selected everything but only one possible answer was there like if you got confused yes which is showing in the selection 21 people got confused right in 22 got it right dear friend of mine convex mirror if it would have been a concave direct answer a right but it is a convex mirror it is a convex mirror now you know it very well that is why this dear friend of mine was saying I got it by the red diagram in convex mirror the image distance is always lesser than the object distance direct answer got it no I understood by the selection of responses okay good good good good good good good good next question Tamil again 980 good fastest one and leading the scoreboard good good good good good good good good next question just read it I don't think so you guys will need pen 36353 is the 35363 35363 yes Neha suppose you get it right now suppose 54 people have already responded that's good you guys are like still receiving responses motivating still in the scenarios one centimeter tall is placed four centimeter in front of a mirror in order to produce an upright image of a three centimeter height magnified is a single word relatable okay okay okay okay okay okay okay okay explanation required are for required are for required good are very good very good relax very good very good okay okay people forgot the question even an object one centimeter tall its erect image is required so the only possible case is concave now it is placed four centimeter in front of the mirror you can't surely keep it at four because in that case you will produce an equal size image the only answer is 12 okay good good good good good good good good good next question is coming the one missed it again so again Tamil is struggling with conceptuals this champion is excellent in numericals good Tamil no problem what is the fastest very good very good very good very good very good and here we go to the next question we are quite good on time so let's utilize it a concave mirror gives an image three times concave mirror gives an image three times plays at a distance 20 centimeter format for the image to be real and focal length should be good good good good good good good now for the touching of pen will be required told us a munger a blank question add Karnataka Karnataka next time let's have a concept test next time who else with me okay a bit of CC one second at the time at the end of the chapter you remember electricity okay okay why yeah this dear friend of ours is playing good so last 20 15 seconds now you'll have to you spend for us but only for us 29 people got it right and yes obvious as soon as you saw the options dear okay magnified and real and inverted right or not object plays at a distance 20 so 20 cannot be there 30 because if it focal length is 30 then you will get a virtual and erect why aren't right good only 10 and 15 are possible if you you get the answer 15 will give you the proportion of 20 and 3 click click see for clear or you need the equation don't tell me that er equation required clear clear clear good good good good good good but this is geometry this is geometry okay it will follow the rules of geometry who again conceptual Pranav is now are in tendon again this he conceptual question and this champion is good good good are in very good very good very good here we go to the next question aditya that doesn't look healthy dear it's not sportsmanship again this is this is requiring a tsunami of answer yeah tsunami tsunami of answer just think as a little so you will think and you will get it right guys I wanted to see that everyone has responded and this getting close by itself all wrong answers leave in the opposite direction of the right answer last five seconds as I wanted to give a hint and I forgot everyone is asking in the chat where where's the end where's the end where's the end are you are I forgot 0 now CNC CNC are there will be a case when both of them will be at the same position CNC center of curvature and center of curvature guys gi got it please don't do that yeah the question was the minimum distance between the object and it's a real image for a convex for a concave mirror sorry okay Sneha don't tell me this this may have leased may have leased no no no dear no the maximum is infinity in two cases it is possible in two cases right when the object is at infinity the image will be at focus when the object is at focus the image will be at infinity very good very good very good let's look at the leaderboard let's look at the leaderboard let's look at the leaderboard okay so good people are there are in again is the fastest one very good are in you play good when it is about concepts very good excellent excellent excellent I'll talk to you the other way next question 20 centimeter from a convex mirror focal length 10 again a tsunami of answers were required but no problem no problem it is coming now I guess one wave came yeah exactly exactly I kept like understanding that at last at times we lag with duration enough so for that I kept like questions which are not required to be solved okay I forgot better 12 or 14 you can see now how many PPC PPT is out of five again the same thing focal length is 10 it is placed at 20 means it is places center of curvature so the image will be formed at now please answer let's look at the leaderboard children are shuffling iron is again the fastest very good very good very good go into the next question go back to the question we'll do that a single we'll do that okay okay okay and then we'll do that we'll do that here please concentrate on this one no problem we'll come back we'll come back to it no problem for a convex mirror magnitude of u is never equal to magnitude of v yes better because in that case focal length yes or no suppose if it is plus minus then the focal length will be like disturb momenta you're right okay go times up for this question what is this now we'll have to look for the two questions okay okay okay okay okay no problem so what's this this was the question iron was asking our in suppose this would have been a corner cave a mirror right or not this is see this would have been the answer this is a convex mirror so these two cannot be the answer at all yes or no even this is not a possible thingy not at equal distances only one correct G I got it everyone everyone who was asking for a clarification okay very good very good relax relax very good next question a point object is placed at a distance of 10 centimeter okay and it's a real image is formed at a distance of 20 centimeter from a concave mirror okay if the object is moved by 0.1 centimeter toward the mirror then the image will shift by about okay now from the very first information set we will calculate f yes or no show very good this away and toward is good away and toward is good but we have to clarify no whether 0.4 or 0.8 right relax and he gave Gupta why you can solve it here and if you're thinking like what we are discussing that's not guessing it's estimating you're estimating like you are making a strategic progress right so like even this away and toward was good strategic which like gave you 50 50 carry these two are not answers okay 0.4 0.8 okay 0.4 0.8 0.4 0.8 now from the first line we can calculate that f yes or no one upon f is equals to placed at a distance of 10 centimeter and it's real images formed at a distance of 20 centimeter okay so this will solve out to be quickly 20 up minus 1 minus here yes or no now for the same f 1 upon v plus 1 upon u the scenario is that if the object is moved to buy 0.1 centimeter toward the mirror so 10.1 add or subtract if or add as for subtract good so it will become minus 9.9 okay so this will shift to what if you will solve you will get you want me to solve I can solve no problem as for solve and are for not required only those who required send me as for solve good aren't very good very good so from here bit of we have to calculate v okay minus 3 by 20 plus can I write it by 10 by 99 okay good good good good good this is minus 3 okay no no zero is here please solve please solve fucking solve please solve please solve please solve please please please please please alchemy alchemy same same same same same way I am 97 why I 1 9 8 0 no now we have to get a simpler way for doing this look oh now we have to get a simpler way no not not this difficult this won't work mother this is okay to solve for a theoretical exam but not for an mcq type okay we have to think about a short ass a step short ass a step short ass a step short ass step it is saying that if the object is moved by point one centimeter toward the mirror so it will go away from the mirror so a and c can be the answer now point four or point eight that is why Gupta was saying Gupta sorry dear I did not understood you initially but there should be thought about logic thought about just if we got 20 by 3 as the focus right focal point object distance image distance proportion is not working no we'll have to calculate no other way as of now okay hello hello fine fine fine fine sorry guys next question sorry sorry we were really good running good on time then somewhere in last two questions we got distracted especially in this last question no problem no problem and here Pranav is going for a good lead Ganesh was the fastest one to respond and Pranav Pranav Pranav Pranav Pranav Pranav Pranav got it right next Next question quickly, quickly, quickly, quickly, quickly, quickly, quickly, quickly, quickly, good, good, good, good, good, easy it was easy for few people, good, good, good, moderate for many of you, good, difficult, difficult, good, good, good, good, good, good, good, good, good, there is one more, okay, do not log out. If I will count till 10 and nothing happens then we will go to the next one, okay. Here we go, next, oh that's fine, that's beautiful, someone said no word, yes dear, we are exploring it, we will explore, okay, we will explore, I have someone sent a smiley, good, good, good, good, this is interesting to look at, I can conduct a, good, good, good, good, good, good, good, really nice, no racking, okay, knowledge giving, enlightening, great, really good, competitive, scientific, thank you very much, thank you very much for your time guys, thanks a lot, thanks a lot, thanks a lot, bye, bye sir, okay people still answering good.