Dispersion

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A diagram of light dispersion through a prism

Dispersion is the idea that the frequency of a wave influences its velocity (speed). Dispersion is most easily seen in light, when all the colors inside white light become separated by a prism. When a white beam is shone at the prism, all of the colors in the light( colour spectrum) slow. Each color then refracts at different angles, making us see a rainbow.