The refraction of light is commonly known as

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 :

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?

The three primary or basic colours are

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

The twinkling of stars is due to atmospheric :

Rainbows are formed by

We can see the sun before the actual sunrise by about:

The blue colour of sky is due to

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