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Question

A ray of white light shows no dispersion on emerging from a glass plate (slab). Is there no dispersion inside the glass plate as well?

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Solution

Dispersion phenomena take place in a glass prism. But in glass slab light disperses into different colors on entering the glass slab i.e. dispersion takes place inside a glass slab also. But when it emerges from its other parallel face, the different colors again combine to form white light.

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