Angular aperture: Difference between revisions
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The '''angular aperture''' of a [[lens (optics)|lens]] is the apparent [[angle]] of the lens [[aperture]] as seen from the [[Focus (optics)|focal point]]: |
The '''angular aperture''' of a [[lens (optics)|lens]] is the apparent [[angle]] of the lens [[aperture]] as seen from the [[Focus (optics)|focal point]]: |
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Revision as of 23:22, 28 November 2006
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The angular aperture of a lens is the apparent angle of the lens aperture as seen from the focal point:
where
- is the focal length
- is the diameter of the aperture.
The angular aperture is approximately equal to twice the numerical aperture of the lens.