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White light always consists of a natural mixture of different colours. Each colour is light at a different wavelength, with different refraction qualities from all other wavelengths. Refraction occurs in some circumstances when light waves pass from one medium to another, such as from air to glass (in a prism) or from air to water (in a cloud or misty rain) and back again. Because each colour, in other words each wavelength, bends a little more or less than each other colour, refraction gives us a rainbow.

The property of refraction depends on the laws of nature, so rainbows have existed on earth since its very formation.

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