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what is refraction?
Refraction is a phenomenon that occurs when waves on passing from one transparent medium to another bend at the boundary between the two mediums. It may also be known as the ability of the eye(s) to bend light in order to focus it on the retina. In Physics refraction is the extent to which a wave is refracted while in astronomy it is the extent of the distortion of the position of an astronomical object as a result of bending of light.


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