Light - Reflection & Refraction 07 | Refractive Index | Power of Lens | Combination of Lenses

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Anybody board in 2024-25

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Attendance here

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Me

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Me❤

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Yes I am

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Ha bhai

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He is the most demanded teacher of PW...for class 10 students

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hn sahi kaha

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Aa😊

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Now, i m in class 12 and still comments are active on this vedio..

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Baat to sahi hai..

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i have never ever seen a physics teacher like u in my whole life. u r legend sir and thank u so much sir for being a good explainer and giving us free education thanks a lot.

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Right free education ... It's good

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Physics wallah ,Alakh pandey sir is best in the world

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[@brrr_22]

close to tears right now i was so scared of this chapter, because a tuition teacher taught me this chapter in such a way that I hated physics. he skipped the basics, scolded me for not getting it at one go and always picked at how I wont pass 10th at my pace. but pw, explained it so simply, and so beautifully that I'm proud of myself for finishing this chapter. and it wasn't that hard either. hats off to you this foundation. saving lives.

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good for u mate

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Same Here Bro

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But your dp 😂

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Today I have got my physics mid term result,I have got the highest and it’s credit goes to you,,,,, thanks Rakshak sir,,,, from Bangladesh 😊🙂

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does In Bangladesh also board exams take place? No offence, Just asking

[@Agnihotri3215]

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Bhai Bangladesh me Hindi v ha kya????

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​@@Edits_by_Ayualmost everyone in indian subcontinent can speak hindi, incl. Bangladeshis, pakistanis, nepalis, etc

[@ashwin7-3-6]

38:33 how cutely sir said mohan...☺️

[@biharigamingplatform47]

Right

[@jagritigupta8281]

50:11 :- speed of light in glass is 2×10^8 m/s.

[@sakshikushwaha4663]

ye m/s kaise hoga ye to unit less quantity h na???

[@aasthagianchandani1154]

@@sakshikushwaha4663 unitless quantity refractive index hoti hai, yahan humne speed of light dhundha hai

[@pransu1579]

@@sakshikushwaha4663 speed of light puchi gayi hai, unitless quantity refractive index hota hai

[@immortal9063]

@@sakshikushwaha4663 wo photons unit less hai aur tb jb wo rest mai ho tb hi otherwise they carry momentum(planck's theory)

[@sakshikushwaha4663]

@Prachi Mishra more bigger than you😏😏

[@justkunzy]

Homework Question: (i) Change in the speed of light will be minimum when the change in refractive index will be minimum.. Therefore, when travel from B to C or C to B it will experience minimum change in its speed due to minimum change in refractive indices of the mediums. (ii) Change in the speed of light will be maximum when the change in refractive index will be maximum.. Therefore, when travel from A to D or D to A it will experience maximum change in its speed due to maximum change in refractive indices of the mediums. Majaa aagya sirji !!!😁

[@manassaxena5386]

Right bro me bhi yahi soch raha tha but i think sir ne question galat padh liya...wo speed of light ko maximum ya minimum soch rahe the but question me "change in speed of light" pucha hai....but glad to see ki tumne bhi sahi answer diya hai... goodluck 👍

[@mahakal772]

Bro your ans is wrong. Watch the hint once. As when the change in 'n' is minimum the light will travel fast.

[@HinduPhoenix]

Galat hai bhai tumahara

[@HinduPhoenix]

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[@jadugarrrrrr...]

Bilkul bhai

[@madhudubey9705]

56:10 1case: D =2.40 the speed of the light will be minimum. 2case: A =1.33 the speed of light will be maximum.

[@assassin4737]

the question is asking about CHANGE IN VELOCITY not ABSOLUTE VELOCITY.

[@Sharmakiran.]

Sir I can't thank u enough for raising such a great teaching of physics with us Really nobody can teach physics like u .......thankuuuuuu🙏

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Best channel and best teacher with a very detailed vdo.... I got to learn more than the ncert text book.... I recently started studying on this channel.... It's too helpful.... Thank you so much to all the teachers here...❣️

[@Sagarcreation_]

56:00 A/D - minimum speed of light B/C - maximum speed of light

[@ashachandra7356]

They have not asked speed of light, instead they have asked minimum and maximum change in speed of light

[@saurabhworks6757]

@@ashachandra7356 You are wrong abL and his answer is correct

[@siddhantkamboj7767]

A to D Change will be maximum B to C Change will be minimum

[@praveen_xy]

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[@shreyanchakraborty1877]

​@@siddhantkamboj7767 wrong

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the best physics teacher ever found. I don't know why my school can not have a teacher like this although my school is very good but then also after completing the chapter from the school i have to again do it at home.

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ig it's the case with most of us coz the teachers really get irritated in schools if we ask them a question more than twice🥲

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Your right, teachers have preasure to finish syllabus, so they dont explain it too well, or make the topic clear.

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I never knew that physics was an interesting subject. All I needed was a great teacher like you, sir. Thank you for your teaching🙏

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Hii man of physics

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All teachers give their best

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To isme hum kya kre

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I was very scared about this topic but when i saw your explanation that gave me a huge knowledge and everything was understood by you.. thanks sir

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56:40 to 56:50 sir khatarnak acting

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The way he teaches very deeply I adore this!!🤞🤞🤞🤞and Rakshak Sir MOP MAHA OVER POWERED!!!!😎😎😎😎

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Same 😊

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Same

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Mine too

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Same !!😊✨

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same bro😀😀

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39:32 literally told my name

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Lol bhai 😂

[@dadhichmishra3684]

55:42 Answer:- Speed of light is minimum in (A) Maximum in D Because As we know that,Refractive index is inversely proportional to the speed of light.Hence if refractive index is more then change in speed of light is maximum and if the refractive index is less then change in speed of light is minimum....

[@titlistgaming4480]

Bro jitna Jada refractive index utni kam speed of light Phir to (A) Me sabse Jada speed hogi(Maximum) Apne A me minimum likha h By mistake

[@padmashukla2999]

@@titlistgaming4480 bhai question accha se padh in which case the change speed will be minimum and maximum

[@rafatrasheed5366]

The word "change in" created all the confusion 😅. Anyways thanks for correcting each other.

[@ayushmanmishra6782]

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@@ayushmanmishra6782 bhai kya hoga iska answer🤔

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Same me

[@ayushiyadav8690]

Bahan aap 10 me ho

[@amritanshu5320]

Me also

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@@ayushiyadav8690 yess, I am in 10 th class...

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@@uzmachaudhary2725 Me too

[@StudyOnly-ws8fp]

Dhoni : Game changer Rakshak sir : physics exam changer 😂😂😂😂😂😂❤❤❤❤

[@priyabratamukherjee375]

Sir ji ap bohut acha padhate ho Bohot maja ata hai apke class mein Ap pura theory ko bohot interesting bana dete ho. Ap ke wajah se mujhe aj physics ke numericals karne mein koi dikkat nahi hoti hai. Ab Sare numericals easy lagte sirf aur sirf apke wajah se. Pehle mujhe ek bhi numericals nahi ati thi. Thank You Sir❤❤❤.

[@AnshuKumar-mt4go]

1) 2*100000000 m/s 2) 1.66 4) a medium is maximum, d medium is minimum

[@jahnujitvsn]

Medium B is maximum bro 🤔

[@sarthakpanwar7967]

@@jahnujitvsn nahi

[@aadityasharma3586]

@@jahnujitvsn nahi bhai 2.40 jyaada dense h

[@eightshotff6020]

Anshu is correct

[@monika--__sharma]

Correct

[@indrapal6274]

Sir you are amazing so amazingly explain the topic before the lecture i couldn't get how to understand the difference between r.i and a.i thankyou so much 🙂🙂

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You are very great sir. I have not experienced the session like this one. I understand all the things which you explain.👍👍

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I think you have praised more than needs😂😂

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Yes

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Thank you sir 🙏🙏

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[@anjalirawat9914]

velocity of speed in medium is inversely proportional to the refractive index therefore, velocity will be maximum in the first case{ a} and will be minimum in the last case{d}

[@assassin4737]

the question is asking about CHANGE IN VELOCITY not ABSOLUTE VELOCITY.

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38:45 the best scene 😂

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I didn't got to know you from the starting of this 10th session, that's sad coz then I would have definitely ace in physics, but it's ok that I got to know you sir in the last 3 months. So better late than never. I will definitely make my younger brother study from you from the starting so that he won't regret anything later 🙌 Maybe you think that you are just teaching, but trust me you have changed the life of students like me whose physics base was not clear!! You are no less than Guru dron for me 🙏🏻

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Aaap abhi bhi yahi adh rahi apne session ke aa Gaye one shot me inhe sir ke😁

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Guru dron hai to ungli bhi mange ka hak hai 😂😂😂😂

[@ragnikumari1868]

I'm very glad today because this topic is very confusing for me almost 3 months but after this session.I am confident in this topic..Thank You so much👍👍

[@priyanshusingh7957]

Same problem 💫😟

[@sanjeevKaumarJha]

Time:- 44:31 Q2. Vm:- 2 × 10 to the power 8

[@shubhhhh__]

Vg = 2×10 to the power 8

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Instead of writing '"to the power"' u can use this symbol denote it on internet "^"

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Love ur teaching ❣️

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Anyone board exam 2024-25 and chahate hei ki KZbin mein jald live class start ho jaye

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Wow! What a nice explanation sir you are the best teacher of physics

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I really had a lot of fun learning this chapter. You are my favourite teacher sir. You have made all my insecurities in topics, my strength. A big thank you to you Rakshak sir

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Right bro 🤟

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57:23 sir aapne sikha kr or hmne sikhkr moj krdi Hat's of to you sir you are great than my school teacher( government school me rkhakr paise khate hai sirf)

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[@pransu1579]

50:10 The speed of light in glass is 2×10⁸ m/s

[@hemantpanchal593]

Sorry to say but u are wrong Answer :- 2 × 108 m/s

[@mrigankshekhar1069]

​@@hemantpanchal593 no you are wrong

[@immortal9063]

@@hemantpanchal593 bhai 2.998*10^8 m/sec

[@danishmushtaqdraboo5729]

The way u teaches is really unique and awseome sir U cleared all concepts of light related to all the all 7 videos and from the depth my heart thanku so much.and i pray to GOD fr urself to keep olwys hppy to u

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I was actually angry that Alakh sir didn't come but you are none less than him sir🙏 . You made those topics crystal clear, plus, your diagram skills are amazing 🔥🔥

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Every thing happened at a fixed time

[@prabhatsingh9185]

Yes

[@IITian_Shivamm]

To dekh le

[@rimjhimgupta6300]

Ans 4 of pyq- minimum velocity in medium D,maximum velocity in medium A

[@assassin4737]

the question is asking about CHANGE IN VELOCITY not ABSOLUTE VELOCITY.

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I want teacher just like you in my 🏫🎒 school and I wish everyone Will have teachers like you in their schools😊

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Your are the best physics teacher I have seen in my 2 years journey with physics

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THANKYOU SO SO MUCH FOR THIS SERIES YOU DON'T KNOW HOW MUCH THIS HELPED ME AHHH! YOU'RE THE BEST PLATFORM ON KZbin YOU GUYYS DESERVE MILLIONS OF SUBSCRIBERS💞

[@aryanstudy6735]

Maximum speed = A Minimum speed of light = D Because denser medium pending light more than less devser medium. Thanks for teaching 👌🙏

[@theeirfan3444]

Bhai ase nhi krna ha

[@youtubeDivyansh]

55:43 Answer. (i) Minimum change is seen as light moves between 1.50 and 1.52, i.e. B and C. (ii) Maximum change when light moves between 1.33 and 2.40, i.e. A and D.

[@yashikaks111]

Hmm ye to samajh aagya but exact koi ek answer nikalne ka koi tareeka hai??

[@youtubeDivyansh]

@@yashikaks111 sab moha Maya ha Is eak question ka multiple answer da raha ha Google alag alag web site pa So ....idk 😐 I don't know why I am writing this shit By

[@Anonymous-x2k]

The above answer is ulta

[@Priya8473]

Sir you are the best teacher.. really 😊😮❤❤❤ Refractive Index was the topic which I found somewhat different and difficult.. so I saw another lectures on that topic but still I didn't understand ,then first time I saw your video and trust me I felt that this topic is like ...... U know ....so easy and too good... Now I will watch only and only yours lectures... 🎉🎉🎉❤❤❤❤ Deeply thanks to u sir ...🎉🎉

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Wow what a amezing talent sir, I didn't see teacher like u.... Intakhab from PAKISTAN

[@anubhabdas5625]

Speed Of Light is minimum in Medium D Speed Of Light is maximum in Medium A

[@swarup4967]

👍

[@brajkhushi06]

It's wrong bro ... Question padhiye dhyan se Speed of light nhi change in speed of light....ke bare me question puchha gya hai

[@shamevfx3357]

​@@brajkhushi06 i think the answer is (i) A TO D AND (II) D TO A because they asked whether light travels from one medium to another^

[@avnisingh5822]

​@@shamevfx3357 yes you are right

[@poki2318]

50:00 Vg= 2x10^8 51:09 Nm=1.6

[@marutidesai1788]

Correct

[@priyajain123]

Kaise aagega plz bata doo😢

[@iwannabeanartist9659]

​@@priyajain123Bro it's just calculation sir have given the hint in video

[@NainaShukla-nq6um]

49:20 Pyq qus 2 Refractive index 1.66

[@mihir4844]

You mean 1.67 😅

[@jungkook3023]

Can u explain how??

[@RajarshiGhosh-h8g]

Its really very appreciating that I finally found the most wanted teacher of Physics !!!!!!!!!!!!!!!!! At the same time I gained some confidence that I am gonna surely overcome my physics exam with wonderful results and its all for you sir . There's no word to praise your outstanding method of teaching . Heartiest thanks from the bottom of my heart . ~From WB , Calcutta ......

[@sasmitasingh5237]

Batch 2023-24 😂😂😂😂

[@princeyadavvlogs4467]

Is these topic’s coming

[@madhudubey9705]

51:00 2Q. the refractive index of the medium is 1.66

[@pritimakumari9526]

Thank you sir... 💞💞💞

[@RadheKrishna14315]

✨ *Important Note* ✨ 1. Value of power of the lens will be in *Positive* in case of *Convex* Lens. ( Because F is active) 2. Value of power of the lens will be in *Negative* in case of *Concave* Lens ( Because F is inactive)

[@pransu1579]

Okk!!✨

[@studiouswicked4903]

1 - velocity of glass - 2*10^8 m/sec 2 - refractive index of medium - 5/3 = 1.66 3 - A medium maximum and D medium minimum becoz refractive index has inverse relation with velocity of medium..

[@Dk-vz6sg]

you should check you answer 2 .don't write unit of refractive index

[@studiouswicked4903]

@@Dk-vz6sg thank you

[@assassin4737]

the question is asking about CHANGE IN VELOCITY not ABSOLUTE VELOCITY.

[@kumudsingh335]

​@@assassin4737aisa hai toh aap hi explain krdo

[@yaeditz130]

​@@assassin4737what???

[@SimranSingh-bl5hs]

Nice sir thank you 😊😊😊😊😊😊😊

[@SimranSingh-bl5hs]

Nice thanks 👍👍👍👍👍👍👍👍👍👍👍 sir please take care 😌😌

[@dhirendrakumar2068]

I am very empress by this lecture thanks❤❤ rakshak sir❤❤😊😊😊😊😊

[@Sh_ine82]

Thanks sir ..... maine kabhi soncha nhy tha ki mjy light chap ka aik b numerical aayega .... but because of you ye possible ho paya ..... Thanks a lot ..... lots of love from kashmir

[@aishwaryabhatnagar8641]

Rakshak sir is real rakshak for our preboard exams🙏

[@obanai____]

Boards too

[@facttubeearth8024]

Yaa. 😗😗😗

[@kartikaghav7203]

As well as board

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not only for preboards but also for boards

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for a moment i thought that you are saying that this sir rakshak (arre jaise ravan tha) woh wala rakshak 😂😂

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He just faded away my all confusions, you're legend sir ji... ✨❤🔥

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on god bro

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Hi

[@Rajeev2294]

Can we talk ?

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@@Rajeev2294 chk bsdk

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Noooooooooooo

[@ArmanSingh-s4p]

Thank you so so so so so much Sir ❤❤❤❤❤❤❤❤❤❤❤🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽 Charan sparsh karta hu 🙏🏽🙏🏽🙏🏽🙏🏽🙏🏽

[@priyaa.ot7]

Sir you are best teacher Mujhe tution ki jarurat nhi h aapse pdhne ke thank you so much 😊😊

[@rechaldua9329]

Pyqs q2 Refractive index is 1.6 in that medium

[@vanshdeepsingh6620]

Thankyou so much sir, you made the concept very clear.🙏🙏

[@criticalgod9]

50:19 The ans of Q1 IS Vg=2×10⁸

[@sarithalohithgowda3086]

Sir you have made this topics as simple as possible.....thank you soo much sir for making this topic easy to understand 👍

[@Pratibha1107]

1) 2×10^8 2) 1.66 4) Minimum - Medium D Maximum - Medium A

[@siddhi6763]

Yes

[@Pratibha1107]

Sir Please upload the video of chapter 3rd numericals

[@i.m__sneha7092]

🥺❤️ hey I would really like to appreciate you for your teaching skills sir! I'm very thankful now all of my doubt's were clear from past 5 days I was a bit stressed as I'm not getting my concepts clear .

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Me too✌️❤️

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Anyone Insta user 🙂✋🏻? If yes then give your I'd name in reply 🙂

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[@yashRajput9958.]

@Not Shubham toh rhn do phr😂

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@@yashRajput9958. yeah

[@hcker2498]

55:08 you can solve this question more easily by the formula : n13 = n12 × n23

[@manxome000]

can you explain this ??!!

[@hcker2498]

@@manxome000 issmein kya explain karna

[@kumarishailja1839]

Kardo bhai explain

[@artivitybyme6463]

yes please explain...

[@prakharmishra6761]

Bhai apka galat hai answer ok

[@fuyukaa..0_0]

Sir you are the best teacher of pw I'm a student of victory batch ICSE class 10 and this topic is in our syllabus and i couldn't understand it through our batch teacher I'm able to understand by you only... Thank you soo much sir ❤

[@Hemant_kalsia]

YRR MATLAB KATAI ZEHAR, KATAI BHYANKAR PHYSICS TEACHER .😎💯🔥😎💯🔥

[@GulshanKumar-wj3bs]

55:51 Maximum -when light travels from medium A to D Minimum- when light travels from medium B to C

[@tanejasaab887]

galat bro

[@Rajnandan_Sharma]

I got the same answer

[@vipinjha2308]

Galat bro

[@vipinjha2308]

Tune ulta likh diya

[@bhairvisimmi3364]

Thanku sooo much sir for such an amazing explanation ❤️❤️🙏🙏

[@PUSHPENDRASINGH-mu5by]

Hii

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After watching your all video i finally understood everything in this chapter. You are great sir☺☺

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Tell me what you understood 😂

[@naveedthaker5362]

Lots of love from kashmir ❤️👻

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Why this👻?

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katik chuk sir haa chu kaaalle magar

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Baya katiuk chukh?

[@wasiqwajahatmalik1309]

@@farookshah7302 nishatuk hai chuss che ketuk

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Thanks sir you are the best physics teacher of the world 🤟🥰🔥🔥

[@ananyaphukan1312]

Give attendance who will give board exam in 2025🎉

[@jordargaming4724]

Me

[@Shubham13319]

Batch kon kharidta hai....Jab Rakshak Sir ka complete explanation wala video available ho....😂😂😂😂

[@itz--anuj794]

Me

[@munna-khan4565]

Tara diyan kidhar hai Tara bai idhar ha

[@anishthakur7529]

Mind your own business 😏

[@aarinsheik1583]

Thank you so much sir..!! Very useful..!! We are blessed to have u in physics wallah foundation..!! 😊

[@ammarkhan4509]

My 1.5 year lost to clear this concept but you really awesome no one says kis medium ka niklega jis light inter karrhi h uska ya jaha se aarhi aap bus clear kerdiya thankyou so much sir ❤️

[@ammarmahmood5887]

Same name

[@비니-u9v]

Acha time stamp dena

[@himalikathaitlockdownserie365]

So now in which class u are

[@utkarsh2972]

Pyq ans 1 👉 speed of light in glass = 2 * 10 to the power 8 m\s

[@jeevak9545]

😂😂😂😂😂😂😂😂😅😢🤪

[@anshraj3446]

57:05 n = c/v v = c/n There fore, speed of light in : A = c/1.33 B = c/1.50 C = c/1.52 D = c/2.40 It shows that the speed of light in medium A is maximum and in medium D is minimum. So, when light travels from any of these mediums to medium A, speed will be maximum and when light travels from any of these mediums to medium D, speed will be minimum

[@ItzDeepanshu_1825]

you explain the ans..very clearly..😇

[@assassin4737]

the question is asking about CHANGE IN VELOCITY not ABSOLUTE VELOCITY.

[@MannuPant-zq9gw]

@@assassin4737 acchiya... 😅😄

[@SohanlalTripathi-n6f]

​@@assassin4737 right bro

[@parthbajpai4915]

20:24 sir said right but there is one more thing is that if you add all power than you also find the power let us assume the total power of the lens is 20D P=1/F 20=1/F F=1/20 .05 meter(5 cm)

[@deshpandesoham2007]

Mohan is not harmed by this video 😂

[@jaiveersingh5692]

Most important lecture for me dil se thank you❤️❤️

[@palaktanwar1035]

PYQ answers - 1 - 2 multiply 10 power 8 2- 1.66 3- 5/3 4- maximum in D and minimum in A

[@Virus-pi4yp]

Answer 4 is wrong

[@tanaykolaskar]

@@Virus-pi4yp right

[@utkarshchaturvedi1238]

👍

[@angelic_priyu]

Minimum in D and maximum in A

[@angelic_priyu]

@@Virus-pi4yp yes ans 4 is wrong

[@anilkute8580]

Very good explanation sir... Thank you ❤❤❤❤🎉🎉🎉🎉😊😊😊😊

[@jarvisai4546]

Sir It was seriously unbelievable that my all doubts got cleared Sir I am extremely thankful for your efforts and the team as well. It is genuinely straight from the heart. Sir sach mai maza aa gya

[@UtkarshkumarTiwari-hj2yy]

Kro mazze bete

[@swayam3555]

SIR YOU ARE THE ONE WHO HAVE THOUGHT THE TOUGHEST TOPIC WHICH IS REFRACTIVE INDEX IN A EASIER MANNER. THANK A LOT SIR 🙏🙏

[@CryptoBoyKrishna]

Kya time pass wala comment karte ho. Jitna time type karne me lagaya utna me kuch padh leta.....

[@Tech_Gamers]

@@CryptoBoyKrishna aur English be dekho😂. RIP grammar

[@santosh2858]

@@Tech_Gamers shut ul guys 🙄do not make fun of anyone pls

[@manas5139]

@@CryptoBoyKrishna tu kyu time paas kar raha hai iska comment padh ke aur reply karke jaa ke padh le thoda bete

[@CryptoBoyKrishna]

@@manas5139 Haha , Still you are here, haha. Why? Lol

[@stefotsufurema13]

56:01 light will travel the fastest in medium A and slowest in medium D as velocity of light in a medium is indirectly prototional to the refractive index of that medium

[@moonheart2569]

Rakshak sir, It helped me so much. Thank you

[@shadanalam6092]

Thank u so much sir and physics wala channel to provide a best lectures to this chapter and god bless u sir.

[@lakshyasoni5244]

8:58 he was not ganpat Rao wapte. He was Babu Rao wapte 😁😁 But lecture was crystal clear🔮

[@sanjanasingh3421]

Uska full name tha Bhai movie dekhna Jake jab Babu Rao ka behas hota hai Johnny lever ke sath 😬🤣😂😂🤣🤣🤣🤣tab batata hai apna name