Dispersion

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A diagram of light dispersion through a prism

Dispersion is the idea that the frequency of a wave depends on its velocity (speed). Dispersion is most easily seen in light, when all the colors inside white light become separated by a prism. In light is caused by refraction. When a white beam is shone at the prism, all of the colours in the light( colour spectrum) slows down. Each of the colours then refract at different times and angle, making us see a rainbow.