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Q.

Is it true that the refractive index of atmospheric air varies with distance above the earth?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
The Refractive index of a medium depends upon the density of the medium. The optical density of the earth's atmosphere decreases with height. This is because the air just near the earth's surface is optically denser under normal conditions. But going upward from the earth's surface, the optical density of air goes on decreasing, and the upper layers of the atmosphere become less dense. This is why the atmospheric index varies with the distance above the earth.
 
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