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...ondenser can consist of one to three lenses providing a combined numerical aperture range of up to 1.3 that makes it useful for medium- to high-magnification o ...Associates, Chicago, IV, 1972 Comment: Three lens versions give numerical aperture of 1:40

...it has a refractive index greater than 1, provides an increased numerical aperture and thus better resolution.

...al to numerical aperture of the object lens. Thus, optical lenses with low numerical apertures give better resolution than those with high values. The human eye

...cope is very small. The depth of field increases with decreasing numerical aperture. The depth of field is frequently, but incorrectly, termed the depth of foc