Relation between Numerical Aperture and Fractional Index Change or Relative refractive index fibre O 

Sar aaj hamara paper tha vah bahut accha paper Gaya video humne aapke sare video attend kiye the

always your explanation is excellent

Sir je very long time after today come video. Please make regular videos. Because your teaching method is very good and easy.

I request all the viewers please share the videos of this channel so that the other student can take benefit of this channel and sir's efforts and let's grow this channel

Sir you are like angel for me....🙏

excellent video sir !

Thankyou sir ❤

Thank you sir

Sir your content and explanation is amazing!!

thank u..

Sir je when you have time please three topics Ehrenfest theorem. Einstein coffcent. Pointing theorem.

sir how did you get (n1+n2)/2 = n1 in the first method?

1 st comment

Sir aap physics ke prectical ki sare topic ki video bnaiye plz Viva ke liye

Sir hamare college k teacher ache nhi padhate kuch samjh nhi aata hai aap k sare lectures mai dekhta hu aur mijhe ache se samjh me v aata hai

Plz add undamped simple harmonic motion

4:54 how is (n1+n2)/2 = n1? Please answer.

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Sir plzzz posted videos for basic electric engineering for b.trch second sem

Sir, abhi Ham b.sc 1st year me hai please iska playlist banakar dijiye

*Sir bsc 3rd year physics ki puri note provide kr dijiye sir plzzzz aap se bdi request h meri sir*

Sir aapne hamein srms main inspire camp bareilly padaya tha

Sir aap bareilly se hai?? Mai bisalpur se hu and pursuing bsc physics hons by Delhi University

Sir please vedio post kijiye

Paper ho gaya ab kyo kara rahe ho 😒😒😠😠

Thank you sir