Why do we see colors in a rainbow

-When sunlight strikes a falling drop of water it is refracted, changed indirection, by the surface of the water.

The light continues into the drop and is reflected from the back of the drop to the front. When the beam hits the front it is refracted again and emerges from the drop as the color spectrum that we see in a rainbow. - The water drop acts like a prism to seperate the light into its different wave lengths.