optical rotation

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optical rotation:

see polarization of lightpolarization of light,
orientation of the vibration pattern of light waves in a singular plane. Characteristics of Polarization

Polarization is a phenomenon peculiar to transverse waves, i.e.
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optical rotation

[′äp·tə·kəl rō′tā·shən]
(optics)
Rotation of the plane of polarization of plane-polarized light, or of the major axis of the polarization ellipse of elliptically polarized light by transmission through a substance or medium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.