Kerr effect

noun Physics.
the double refraction of light in certain substances, produced by an electric field.

1905–10; named after John Kerr (1824–1907), Scottish physicist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Kerr effect
1.  Also called: electro-optical effect the production of double refraction in certain transparent substances by the application of a strong electric field
2.  Also called: magneto-optical effect a slight elliptical polarization of plane polarized light when reflected from one of the poles of a strong magnet
[C19: named after John Kerr (1824--1907), Scottish physicist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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