A light ray is incident perpendicularly to one face of a `90^circ` prism and is totally internally
Channel: Doubtnut
Date: 2020-07-05

A light ray is incident perpendicularly to one face of a `90^circ` prism and is totally internally reflected at the glass-air interface. If the angle of reflection is `45^circ`, we conclude that the refractive index n