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angular magnification

American  

noun

Optics.

  1. the ratio of the angle subtended at the eye by the image formed by an optical instrument to the angle subtended at the eye by the object being viewed.

angular magnification British  

noun

  1. physics the ratio of the angle subtended at the eye by an image formed by an optical instrument to the angle subtended at the unaided eye by the object

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.