51Թ

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retrodirective

[re-troh-di-rek-tiv, -dahy-]

adjective

Optics.

  1. (of a mirror, reflector, etc.) having three reflecting surfaces so oriented that a ray of light is reflected in a direction parallel but opposite to its original direction.

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51Թ History and Origins

Origin of retrodirective1

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retrocognateretrofire

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