meniscus lens


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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 ?
To complete the meniscus lens, the flat surfaces of the two elements have to be cemented together with the correct offset.
Maksutov's notebooks reveal that in 1936, when he was contemplating Mangin mirrors (lenses with one silvered surface, primarily used in spotlights and lighthouse beacons), he had penciled in the margin a little sketch showing the reflective and refractive elements of a Mangin mirror separated to form a meniscus lens and a mirror.
He showed how the large negative spherical aberration of the primary mirror could be compensated by the positive aberration of an achromatic meniscus lens.