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electron optics

noun, (used with a singular verb)
the study and use of the physical and optical properties of beams of electrons under the influence of electric or magnetic fields.
Origin of electron optics
First recorded in 1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for electron optics

electron optics

(functioning as sing) the study and use of beams of electrons and of their deflection and focusing by electric and magnetic fields
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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