Fresnel mirrors

Fresnel mirrors

noun Optics.
two plane mirrors joined together in a way that makes them useful for studying interference patterns.

Origin:
1965–70; see fresnel
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Fresnel mirrors is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
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