| 单词 | exit pupil |
| 释义 | > as lemmasexit pupil exit pupil n. the image of the aperture stop formed by rays of light after they have passed through an optical system, spec. the bright disk visible through the eyepiece when an optical instrument (such as a camera, telescope, gunsight, etc.) is directed towards a light source; the diameter of this image.Cf. entrance pupil n. at entrance n. Compounds 2. ΚΠ 1898 Jrnl. Royal Microsc. Soc. 470 Entrance-pupils and exit-pupils of the Microscope must be on the same points of junction. 1945 Pop. Mech. Dec. 99/1 The preliminary calculation should determine the exit pupil and luminosity. 1977 Backpacker Aug. 48/1 The exit pupil is important in determining the quality of a binocular. It should be perfectly round. 2002 Pop. Photogr. Apr. 18/1 The viewfinder is a typical point-and-shoot real-image finder.., and, with its small exit pupil, it has that annoying tendency to blank out if you don't keep your eye exactly centered. < as lemmas |
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