Question

why we can able to see a band of seven colour when a white light falls on a prism ?​

Answer 1

Answer:

The rainbow

Rainbow is formed when it is raining at the time of sunshine. When the whitesunlight falls on the raindrops and leaves them, then the white light is refracted and an arc of seven colours is formed in the sky. In this situation, tiny raindrops act as glass prism splitting the whitesunlight.