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correcting plate

American

Or corrector plate

noun

Optics.

a thin lens used to correct incoming light rays in special forms of reflecting telescopes.

Example Sentences

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In front of it, to bring the light to a focus without "spherical aberration," is a correcting plate so slightly curved that it looks like plain sheet glass.

From Time Magazine Archive

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