# The Obedient Reflected Ray

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Two mirrors are joined at a fixed angle at . A ray of light shines into the angle between them, parallel to the horizontal mirror and at a given height. It bounces a number of times. Suppose it strikes the lower mirror at right angles at and then reemerges along the original path. This is called an *obedient ray*.

Contributed by: Izidor Hafner (December 2015)

Open content licensed under CC BY-NC-SA

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They are equal.

Reference

[1] D. Wells, *The Penguin Book of Curious and Interesting Puzzles*, New York: Penguin Books, 1992.

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