Write the conditions for observing a rainbow Show, by drawing suitable diagrams, how one understands the formation of a rainbow.

Explanation

The conditions for observing a rainbow are `:`

(i) The sun comes out after a rainfall.
(ii) The observer stands with the sun towards his `//` her back.
Formation of a rainbow `:`
The rays of light reach the observer through a refraction, followed by a refraction.
Figure shows red light,from drop 1 and voilet light from drop 2, reaching the observers eye.