Question

define critical angle . write the relation between refractive index and critical .angle

Answer 1

Answer:

the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected

The ratio of velocities of a light ray in the air to the given medium is a refractive index. ... Thus, the relation between the critical angle and refractive index can be established as the Critical angle is inversely proportional to the refractive index