magnetic lens

noun

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

magnetic lens

noun

1. 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

Word History and Origins

Origin of magnetic lens¹

First recorded in 1915–20

Example Sentences

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