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A wave vibrating in the direction of propagation.

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Refraction is the change in direction of wave propagation due to a change in its transmission medium. The phenomenon is explained by the conservation of energy and the conservation of momentum.

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

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

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

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

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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 lowest point on a wave.

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Reach the top of ( something such as hill or wave).