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Refraction
the bending of light
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The bending of light as it passes from one medium to another is called
refraction.
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The angle and wavelength at which the light enters a substance
and the density of that substance determine how much the light
is refracted. The refraction of light by atmospheric particles
can result in a number of beautiful optical effects like
halos, which are produced when sunlight
(or moonlight) is refracted by the pencil-shaped ice crystals
of cirrostratus clouds.
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