Encyclopedia > Angular aperture

Article Content

Angular aperture

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

<math>a = 2 \arctan \frac {A} {2 f}</math>

where <math>f</math> is the focal length, and <math>A</math> is the diameter of the aperture.

Featured Article

Christiania

... name of Oslo, from 1624 to 1925. The Free State of Christiania - a partially self-governing neighborhood in the city of Copenhagen. This is a disambiguation page; ...