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.

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Origin:
1930–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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a chattering or flighty, light-headed person.

a fool or simpleton; ninny.

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Collins

World English Dictionary

electron lens

—n
	a system, such as an arrangement of electrodes or magnets, that produces a field for focusing a beam of electrons

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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