Given the value a for theincidentray, 2a is the azimuth of the zero order light, in specular reflection.
From theCambridge English Corpus
If theincidentrayis precisely at the critical angle, the refracted ray is tangent to the boundary at the point of incidence.
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Wikipedia
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The angle of incidence is the angle between theincidentrayand the surface normal (an imaginary line perpendicular to the surface).
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Like reflections theincidentray, the refracted ray and the normal all lie in the same place however the angle of refraction is always less than the angle of incidence.
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Corner reflectors retroreflect light, producing reflected rays that travel back in the direction from which the incident rays came.
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A white body is one with a rough surface that reflects all incident rays completely and uniformly in all directions.
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