Exercise

From incident white light how will you obtain white emergent light by making use of two prisms?

You must have seen chandeliers having glass prisms. The light from a tungsten bulb gets dispersed while passing through these prisms and we see coloured spectrum. If we use an LED light instead of a tungsten bulb, will we be able to see the same effect?

Blue light has longer wavelength than red light.

The refractive indices of four materials $- \mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ are $1.89, 1.61, 1.50$ and $1.33$ respectively. When a light ray travelling in air enters each of these materials separately, which material will produce minimum bending?

Will the velocity of light be same in all media?

A monochromatic ray of light strikes the water $\left(n=\frac{4}{3}\right)$ surface in a cylindrical vessel at an angle of incidence $53°$. Depth of water is $36\text{ cm}$. After striking the water surface, how long will the light take to reach the bottom of the vessel? 

Compared to air, the speed of light in glass is

What is absolute refractive index? Find the speed of light in water, if the absolute refractive index of water is $\frac{4}{3}$.