Question

what is wave normal?
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Answer 1

Answer:

A unit vector which is perpendicular to an equiphase surface of a wave, and has its positive direction on the same side of the surface as the direction of propagation. One of a family of curves which are everywhere perpendicular to the equiphase surfaces of a wave.

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Answer 2

Answer:

Wave normal: A perpendicular drawn to the surface of a wave front at any point of a wave front in the direction of propagation of light waves is called a wave normal.