Assertion :The sun rises some time before the actual sun-rise. Reason: The early rise of the sun is because of the refraction through the different layers of the atmosphere.

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.
Different layers of the atmosphere have different refractive indices. So during rising, the rays are refracted the most when they enter most obliquely such that they appear to be coming from a point higher than the location of the sun w.r.t the horizon. So sun appears to have risen a little earlier. Thus assertion and reason are both correct and the reason is the correct explanation for assertion.

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