Question

How is this change relevant to the existence of each of the colors?

Answer 1

where is your full question???

Where are the colors??
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Answer 2

A rainbow basically has seven different colors due to water droplets being there in the atmosphere. It splits the sunlight into its seven constituent colors. Similarly, a prism also splits white light into its seven colors.

When light leaves a medium and then enters another medium, the light undergoes a change in its direction and propagation. It is known as refraction. Each color is important here so that they have different bandwidths and features that help them in studying minutely.