Total internal reflection can take place when light travels from:

Pick out the longest wavelength from the following types of radiations.

The splitting of white light into its constituent colours is called

When a CD (compact disc used in audio and video systems) is seen in sunlight,rainbow like colours are seen.This can be explained on the basis of the phenomenon of :

The stars appear higher in the sky than they actually are,due to :

Who discovered by his experiments with glass prisms that white light consists of seven colours?

Which colour is used in signal lamps?

When a mirror is rotated by an angle θ,the reflected ray will rotate by :

The twinkling of stars is due to atmospheric :

Suppose a rocketship is receding from the earth at a speed of 2/10 th the velocity of light.A light in the rocketship appears blue to the passengers on the ship.What colour would it appear to an observer on the earth?