meniscus lens


Also found in: Dictionary, Thesaurus, Medical.

meniscus lens

(mĕ-niss -kŭs) A lens in which the two surfaces have different or sometimes equal curvatures but, unlike a concave or convex lens, curve in the same general direction. A positive meniscus is thicker at the center than at the edges; a negative meniscus is thinner at the center. See illustration at lens.

meniscus lens

[mə′nis·kəs ′lenz]
(optics)
A lens with one convex surface and one concave surface.
References in periodicals archive ?
It consists of a spherical primary mirror and a sub-aperture meniscus lens that corrects for the spherical aberration and tilt of the primary.
It was clear from the beginning that such a meniscus lens could be made achromatic (bringing all colors to the same focus), but a quick calculation showed that it would produce noticeable spherical aberration.
He showed how the large negative spherical aberration of the primary mirror could be compensated by the positive aberration of an achromatic meniscus lens. He also discovered that such a system, in addition to being aplanatic, is almost completely free of astigmatism.