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How to Make and Use Retroreflectors

Written and photographed by Forrest M. Mims III

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A retroreflector is an optical device that returns an oncoming beam of light back to its source. It can be as simple as a tiny glass sphere or a type of prism formed from glass or plastic.

While ordinary flat mirrors also reflect light, the light isn’t reflected back to the source but off to the side at the same angle the ...

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