A ray of light  traveling in glass `(mu=3//2)` is incident on a horizontal glass-air surface
Channel: Doubtnut
Date: 26/07/2020

A ray of light  traveling in glass `(mu=3//2)` is incident on a horizontal glass-air surface at the critical angle `theta_(C)`. If a thin layer of water `(mu=4//3)` is now poured on the glass-air surfac, the angle at which the ray emerges into air at the water-air surface is