Learn about the dispersion of light, the electromagnetic spectrum, and how sunlight contains a range of wavelengths (photons of differing energy) with this video segment from Shedding Light on Science. Isaac Newton investigated sunlight by shining it through a glass prism; after the prism refracted the light, he saw a spectrum of colors. He recognized that sunlight was made up of many colors, which could not be further separated when passed through a second prism. Drops of water in the air have the same dispersion effect. In the video, a bowl of water is used to simulate a giant raindrop to show how the differing angles of refraction of different wavelengths create rainbows.
This video segment was adapted from Shedding Light on Science.