The speed of light in diamond is 125,000 km s^-1. What is the refractive index? (Speed of light in air = 3 x 10⁸ m s^-1).

The refractive index of water with respect to air is 4/3. What is the refractive index of air with respect to water?

In refraction of light through a prism, the light ray:

1. suffers refraction only at one face of the prism
2. emerges out from the prism in a direction parallel to the incident ray
3. bends at both the surfaces of the prism towards its base
4. bends at both the surfaces of prism opposite to its base.

A ray of light suffers refraction through an equilateral prism. The deviation produced by the prism does not depend on the:

1. angle of incidence
2. colour of light
3. material of prism
4. size of prism