Mirrors reflect light rays such that the angle of reflection equals the angle of incidence. Public Domain Image, source: Christopher S. ![]() If mirrors truly flipped left to right, then the green and blue parts of the box would be exchanged in the mirror image, which is clearly not the case. Tracing a few representative light rays from their reflection point on the mirror back to their image point reveals that a mirror preserves the position of the sides but exchanges front and back positions. Here we are looking down on a colored box on a white rug in front of a mirror.
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