When light goes from one medium to another medium having different optical densities, then refraction of light rays (or bending of light rays) takes place. The refraction of light caused by the earth's atmosphere (having air layers of varying optical densities) is called atmospheric refraction.
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When light goes from one medium to another medium having different optical densities, then refraction of light rays (or bending of light rays) takes place. The refraction of light caused by the earth's atmosphere (having air layers of varying optical densities) is called atmospheric refraction.