Discussion :: Universe
- The altitudes of heavenly bodies appear to be greater than they actually are. This is due to ________
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A.
Vertical motion of these heavenly bodies |
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B.
Motions of the earth |
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C.
Atmospheric refraction |
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D.
These are visible because of light of the sun reflected from their surface |
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Answer : Option C
Explanation :
Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. This refraction is due to the velocity of light through air, decreasing (the refractive index increases) with increased density. Atmospheric refraction near the ground produces mirages. Such refraction can also raise or lower, or stretch or shorten, the images of distant objects without involving mirages.
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