Question
Dispersion is caused by refraction and not by reflection. Why?
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Answer
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.
$\rightarrow$ 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.
$\rightarrow$ 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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