Assertion: A light of violet colour deviates the most and the light of red colours the least while passing through a prism.

Reason: For a prism material, the refractive index is highest for red light and lowest for violet light.

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If both assertion and reason are true and the reason is the correct explanation of assertion.

If both assertion and reason are true, but the reason is not the correct explanation of assertion.

If the assertion is true, but the reason is false.

If the assertion is false, but the reason is true.

answer is B.

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Detailed Solution

Both assertion and reason are true, but the reason is not the correct explanation of assertion.
Assertion: Here, we can say that the angle of deviation of light is directly proportional to the refractive index. When passing through a prism, violet light deviates the most while red light deviates the little.
Reason: The refractive index of a prism material is greatest for violet light and least for red light.
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