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Dispersion is caused by refraction and n...

Dispersion is caused by refraction and not by reflection. Why?

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White light is composed of seven colours having different wavelengths. And speed of different colours is the same in vacuum/air while in different media it is different.
Now, for a given angle of incidence, the angle of reflection is the same for all the wavelengths of white light, while the angle of refraction is different for different wavelengths.
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