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If the earth has no atmosphere then the length of the day will be
A) increased due to lack of atmospheric refraction
B) increased due to lack of scattering of light
C) decreased due to lack of atmospheric refraction
D) decreased due to lack of scattering of light
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Answer:
Option C: decreased due to lack of atmospheric refraction
Explanation:
Atmospheric refraction causes the Sun to appear 2 minutes before it is actually at the horizon and 2 minutes after it is actually below the horizon. So, if atmosphere is not present, the duration of day would be decreased by 4 minutes.
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