Q.3 (v) Answer the following with respect to the ‘Formation of Rainbow’ :(a) Draw a neat diagram to show the formation of rainbow.(b) Name any two natural processes involved in formation of rainbow.(c) What does a small droplet of water act as ?

Answer: (b) Dispersion and refraction (with internal reflection); (c) a small prism.

(a) Diagram: draw a spherical water droplet. Sunlight (white light) enters at the upper surface and is refracted and dispersed into colours, is reflected internally at the back surface of the droplet, and is refracted again as it leaves. Show red emerging at a higher angle and violet at a lower angle, with the observer’s back to the sun.

(b) Dispersion of light and refraction of light (along with total internal reflection inside the droplet).

(c) Each small droplet of water acts as a small prism.