Have a Question or Comment on this Article?

Categories: Optics

Angular aperture

The angular aperture of a lens is the appearant angle of the lens aperture as seen from the focal point:

$a = 2 \arctan \frac {A} {2 f}$

where $f$ is the focal length, and $A$ is the diameter of the aperture.

See also: f-number, numerical aperture

Categories: Optics

Top Encyclopedia Articles

Encyclopedia Index

human sexuality

human growth hormone

human genome project

<a href="http://c.casalemedia.com/c?s=61745&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=61745&u=http%3A%2F%2Fbiologydaily.com&f=3&id=0&if=0" width="120" height="600" border="0" alt=""/></a>

07-14-2008 23:18:10
The contents of this article are licensed from Wikipedia.org under the GNU Free Documentation License. How to see transparent copy