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quarter-wave plate

[kwawr-ter-weyv] /ˈkwɔr tərˌweɪv/
noun, Optics.
1.
a crystal thin enough to cause a phase difference of 90° between the ordinary and extraordinary rays of polarized light, thereby converting circularly polarized light into plane polarized light.
Compare half-wave plate.
Origin
1880-1885
1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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