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half-wave plate

[haf-weyv, hahf-] /ˈhæfˌweɪv, ˈhɑf-/
noun, Optics.
1.
a crystal thin enough to cause a phase difference of 180° between the ordinary and extraordinary rays of polarized light, thereby changing the direction of the plane of polarization.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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