angular aperture


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Related to angular aperture: aperture angle

angular aperture

[′aŋ·gyə·lər ′ap·ə·chər]
(optics)
The angle subtended at an axial object point of an optical instrument by the radius of the entrance pupil.
References in periodicals archive ?
With lenses of the largest possible angular aperture, in media with the highest possible refractive index, the Abbe equation limits optical resolution to about 200 nm.
r] is given by the angular aperture [DELTA] of the slits.
In laboratory diffractometers the angular aperture [DELTA] is typically [approximately equal to]0.