Question: The Comer Reflector An inside comer of a cube is lined with mirrors to make a comer reflector (see Example 33.3 in Section 33.2). A

The Comer Reflector An inside comer of a cube is lined with mirrors to make a comer reflector (see Example 33.3 in Section 33.2). A ray of light is reflected successively from each of three mutually perpendicular mirrors; show that its final direction is always exactly opposite to its initial direction.

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