Question

A ray of light is incident on the surface of water. For what angle, the ray will undergo total internal reflection?​

Answer 1

Answer:

In general, total internal reflection takes place at the boundary between two transparent media when a ray of light in a medium of higher index of refraction approaches the other medium at an angle of incidence greater than the critical angle. For a water-air surface the critical angle is 48.5°.

Answer 2

There will be partial reflection and partial refraction of the incident ray of light. Now since the ray of light gets refracted at an angle greater than the incident angle, the angular difference between the refracted ray and the incident ray will be less than 180−2θ ..