Why the white colour change spectrum of light in prism?
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White light consists of seven colours. When the white light passes through the prism the light gets splitted into seven colours .
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Explanation:
The cause of dispersion of white light is the change in speed of light with wavelength.
When white light enter the first surface of prism , light of different colour due to their different speed in glass , gets deviated through different angle toward the base of prism that is dispersion (splitting) of white light into constitute colour take place at first surface of prism.
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