One light wave is incident upon a plate of refracting index`mu`.incident angle`i`,for with
Channel: Doubtnut
Date: 2020-08-23

One light wave is incident upon a plate of refracting index`mu`.incident angle`i`,for with refractive &refelctive waves are mutually perpendicular will be  (1) `i=45^(@)` (ii)`i=sin^(-1)(mu)` (iii)`i="cosec"^(-1)(mu)` (iv)`i=tan^(-1)(mu)`