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A wave vibrating in the direction of propagation.

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The fact or phenomenon of light, radio waves, etc., being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

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A crest is the point on a wave with the maximum value or upward displacement within a cycle.

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Trough (physics), the lowest point on a wave.

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An oscillation of the parts of a fluid or an elastic solid whose equilibrium has been disturbed, or of an electromagnetic wave.

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The throwing back by a body or surface of light, heat, or sound without absorbing it.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.

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A substance that makes possible the transfer of energy from one location to another, especially through waves.

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Situated or extending across something.

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The process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.