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Q.

Is it true that a star sometimes appears brighter and some other times fainter?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
Due to atmospheric refraction, the light coming from the star bends and undergoes refraction many times, which occurs in a medium of slightly varying refractive index, and therefore we can see the apparent position of the star instead of its real position.
Because of atmospheric refraction, the apparent position of the star fluctuates, and the amount of light entering the eye flickers. That is why stars sometimes appear brighter and some other times fainter.
 
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