angular aperture


Also found in: Dictionary, Encyclopedia, Wikipedia.
Related to angular aperture: aperture angle

an·gu·lar ap·er·ture

the angle, in air, of light that passes from the object to the ends of the diameter of the front lens of the microscope objective.
References in periodicals archive ?
r], the angular aperture of the incident beam Soller slits [[DELTA].
D] are the angular apertures of the slits (see Fig.
However, most commercial diffractometers are supplied with Soller slits having angular apertures [DELTA] between 2[degrees] and 5[degrees], and in such cases the breadth of the aberration profile is reduced quite dramatically.