Assertion :There is no dispersion of light refracted through a rectangular glass slab. Reason: Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.

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
The faces at which the refraction's occur are parallel in a rectangular slab. At the first face, different wavelengths have different angles of refraction. However, on emergence from the second face, all the wavelengths are parallel to each other.while triangular prism's faces are at some angle.Because of this the rays suffer second refraction in such a way that rays disperse at higher angle.
Both are correct statement but reason is not true explanation of assertion.

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