aperture
Use Aperture in a sentence
ərBased on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source
| a scrap or morsel of food left at a meal. |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
aperture (ˈæpətʃə) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| 1. | a hole, gap, crack, slit, or other opening |
| 2. | physics |
| a. a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it | |
| b. See also relative aperture the diameter of such an opening | |
| [C15: from Late Latin apertūra opening, from Latin aperīre to open] | |
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
aperture
Cite This Source
aperture ap·er·ture (āp'ər-chər)
n.
An opening, such as a hole, gap, or slit.
A usually adjustable opening in an optical instrument, such as a microscope, a camera, or a telescope, that limits the amount of light passing through a lens or onto a mirror.
The diameter of such an opening.
The diameter of the objective of a telescope or microscope.
ap'er·tur'al adj.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
aperture
in optics, the maximum diameter of a light beam that can pass through an optical system. The size of an aperture is limited by the size of the mount holding the optical component, or the size of the diaphragm placed in the bundle of light rays. The hole in the mount or diaphragm that limits the size of the aperture is called an aperture stop. Thus, an aperture stop determines the amount of light that traverses an optical system and hence determines the image illumination
Learn more about aperture with a free trial on Britannica.com.
Cite This Source
