Faraday effect(redirected from Rotation measure)
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The rotation of the plane of polarization of either a plane-polarized light beam passed through a transparent isotropic medium or a plane-polarized microwave passing through a magnetic field along the lines of that field. Also called Faraday rotation.
[After Michael Faraday.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.