The speed of light in air is 3 x 10⁸ m s^-1. Calculate the speed of light in glass. The refractive index of glass is 1.5.

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).

A ray of light of wavelength 6600 Å suffers refraction from air to glass. Taking _aμ_g = 3/2, find the wavelength of light in glass.

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.