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a wave vibrating in the direction of propagation.

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Light reflects from a smooth surface at the same angle as it hits the surface

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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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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 wave forms produced.

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A transverse wave is a moving wave that consists of oscillations occurring perpendicular (right angled) to the direction of energy transfer (or the propagation of the wave).

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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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the oscillating, reciprocating, or other periodic motion of a rigid or elastic body or medium forced from a position or state of equilibrium.

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The trough of a wave is the point where the wave is at its lowest and smallest, while the peak is the highest point of the wave.

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