magnetic lens

American

noun

Physics. an electron lens using magnetic fields for focusing an electron beam.

magnetic lens British

noun

a set of magnets, esp electromagnets, used to focus or defocus a beam of charged particles in an electron microscope, particle accelerator, or similar device

"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

Etymology

Origin of magnetic lens

First recorded in 1915–20

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It also has the best magnetic lens cap I have ever seen.

From The Verge

The lime green plastic mount isn’t the nicest-looking, but it does allow for each magnetic lens to be snapped on and off with ease.

From Time

Some of them pass through a thin metal window in the vacuum-tank wall and are focused by a magnetic lens into a beam.

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023