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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
1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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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