Define critical angle and explain it with a neat ray diagram? Deduce the relation between critical angle and refractive index.

Define critical angle for a given medium

The critical angle for diamond (refractive index = 2) is

State the relation between the critical angle and the absolute refractive index of a medium.

A ray of light incident on the horizontal surface of a glass slab at 70^@ just grazes the adjacent vertical surface after refraction. Complete the critical angle and refractive index of glass.

The critical angle for water is 48.2^@ . Find is refractive index.

How is the critical angle related to the refractive index of a medium ?

A glass slab has a critical angle of 30^(@) when placed in air. What will be the criticle angle when it is placed in liquid of refractive index 6/5 index?

What is meant by the term 'critical angle'?

Explain the term critical angle with the aid of a labelled diagram.

Under what conditions is the phenomenon of total internal reflection between the critical angle of incidence and the refractive index of the medium.