Q.

The stars appear higher in the sky than they actually are due to atmospheric [[1]] of light.


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Detailed Solution

The stars appear higher in the sky than they actually are due to atmospheric refraction of light.
"The bending of light that occurs when it passes through the atmosphere is called atmospheric refraction." Light from a star reaches the earth's atmosphere, and then the light bends or refracts. Air at higher levels of the atmosphere is rarer and denser at lower levels. Hence, the light bends more in the denser medium. Due to the refraction, the star appears to be at a higher position.
  
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