Assertion(A): If there were no atmosphere, the duration of the day on earth would be decreased.
Reason(R): Due to refraction in the atmosphere, the sun appears to rise earlier and sets later.

Both assertion and reason are true, and reason is the correct explanation of the assertion.

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

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Assertion is true, but reason is false.

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Assertion is false, but reason is true.

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Solution

The correct option is A Both assertion and reason are true, and reason is the correct explanation of the assertion.

Because the light from the Sun is refracted as it passes through the Earth's atmosphere, the Sun is still visible after it is geometrically below the horizon and it is visible before it rises. So, if there were no atmosphere, no refraction would take place and hence, day time would decrease.

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