Optics
The Infinity Well
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Look down and see a tunnel of lights that seems to go on forever.
There are two mirrors facing each other: a normal mirror at the bottom and a see-through one on top. Light bounces back and forth between them, and each bounce makes another, fainter copy of the lights, farther down the tunnel.
Count the rings of light. Why does each one look a little dimmer than the last?
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