Spectroscopic Transitions

LASER , selection rule , Einstein's coefficient

[@mofazzalhossain2944]

You have a unique style of teaching.

[@aniketaggarwal1224]

but stimulated emission = spontaneous emission = - d N2 / dt and sir is adding them both so it should be - 2 d N2 / dt and not - d N2 / dt

[@space-time-somdeep]

18:19 wow..❤

[@ankitmishra2723]

Thanks sir

[@sayantanroy6111]

With due respect... please write big