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electron lenses

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electron lens

–noun
a combination of static or varying electric and magnetic fields, used to focus streams of electrons in a manner similar to that of an optical lens.

Origin:
1930–35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: electron lens
Function: noun
: a device for focusing a beam of electrons by means of an electric or a magnetic field
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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