exit pupil


nounOptics.
  1. the ridge of the entrance pupil of an optical system, indicating the place where the pupil of the eye should be placed to view the object.

Words Nearby exit pupil

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use exit pupil in a sentence

British Dictionary definitions for exit pupil

exit pupil

noun
  1. the smallest cross section of the beam of light from the eyepiece of a telescope through which all the light from the eyepiece passes. Its diameter is equal to the ratio of the focal length of the eyepiece to the focal ratio of the telescope

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