Explain atmospheric refraction name some of the phenomena due to it
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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 with increased density.
Starlight undergoes refraction many times before reaching the earth. It occurs because there is a gradual increase in the refractive index from the atmosphere to the earth's surface. Sunrise and delayed sunset: The Sun appears to rise 2 minutes earlier and set 2 minutes later due to atmospheric refraction.
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