What acts as tiny prisms in the formation of a rainbow?

Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark (i) incident ray (ii) emergent ray, and (iii) angle of deviation.

What is a rainbow? What are the two conditions necessary for the formation of a rainbow in the sky?

Name the process which is involved in the formation of a rainbow.

What are the seven colours seen in a rainbow?