- The process via which a wave abruptly changes direction when passing from a medium within which it has one propagation velocity, into another in which it has a different propagation velocity. The ray entering the second medium is the incident ray, while the refracted ray is that resulting after bending. For example, a light ray passing at an angle from air into glass is refracted, as light travels more slowly through glass. Other forms of electromagnetic radiation, such as microwaves or X-rays may also be refracted, in addition to sound waves. Also, the effect refraction has on a wave.
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