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

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A well cut diamond shines due to total internal reflection.
$n \times s i n C = 1$ , where the n is refractive index of diamond $2.42$
$s i n C = \frac{1}{2.42}$ , so , $C = {24.4}^{o}$
Any incident ray with more incidence angle than critical angle will go through internal reflection.

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