http://demonstrations.wolfram.com/LawsOfReflection/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
See how the laws of reflection work: (1) the incident and the reflected rays (both yellow) and the normal (orange) to the surface of reflection all lie in the same plane; and (2) the angle of the incident ray is equal to the angle of the reflected ray; ...
Contributed by: Enrique Zeleny
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