The change in direction or bending undergone by wave*s when they transmit from one medium to another. The bending corresponds to a change in the wave's wavelength* and speed in the new medium.

The amount a wave bends depends on the angle at which it encounters the interface. This relationship is described by Snell’s Law. The greater the angle of incidence, the larger the amount of refraction. A wave that encounters a surface with an angle of incidence of zero does not refract.

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