Definition: | 1) a wave, which appears beyond a surface separating two different media when an incident wave meets the surface, which propagates away from the surface, generally in a different direction, and which is interpretable by geometrical optics
2) a wave which propagates in a medium with properties varying continuously in space and which is interpretable by geometrical optics
NOTE – In the first case but not in the second one, the refracted wave is associated with a reflected wave.
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