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Dictionary

quar'ter-wave plate"

Pronunciation: (kwôr'tur-wāv"), [key] Optics.
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. Cf. half-wave plate.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

quarter tone

quartet

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