Assertion :A beam of white light shows no dispersion on emerging from a glass slab. Reason: Dispersion in a glass slab is zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Velocity of light is different for different mediums. On entering the glass slab, the constituents' colors of white light undergo different amount of deviation. Thus there is dispersion inside the glass slab. After refraction at the two parallel to the direction of incidence of white light on the slab, but is laterally displaced. The beam of light has several rays, each of which is displayed by the glass slab. These rays combine again and form white light and emerge out as white light.
So option B is correct

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