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Question

The altitudes/height of heavenly bodies appears to be greater than they actually are. This is due to ____________________.
  1. Vertical motion of these heavenly bodies
  2. Motions of the earth
  3. Atmospheric refraction
  4. These are visible because of light of the sun reflected from their surface

A
Atmospheric refraction
B
Vertical motion of these heavenly bodies
C
Motions of the earth
D
These are visible because of light of the sun reflected from their surface
Solution
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Atmospheric refraction
When sunlight enters the earth's atmosphere, it continuously goes from rarer to the denser medium and hence refraction of light takes place. The refraction of light taking place in the atmosphere is known as atmospheric refraction.

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