Assertion :The diamond shines due to multiple total internal reflections. Reason: The critical angle for diamond is ${24.4}^{0}$

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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Assertion is incorrect but Reason is correct

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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 brilliance of diamond is due to total internal reflection of light. $μ$ for diamond is 2.42, so that critical angle for diamond air interface is $C = {24.4}^{0}$ (from $s i n C = 1 / μ) .$ The diamond is cut suitable so that light entering the diamond from any face suffers multiple total internal reflections at the various faces and remains within the diamond. Hence the diamond sparkles.

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