meniscus lens


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me·nis·cus lens

a lens having a spheric concave curve on one side and a spheric convex curve on the other.

me·nis·cus lens

(mĕ-nis'kŭs lenz)
A lens having a spheric concave curve on one side and a spheric convex curve on the other.
Synonym(s): meniscus (1) .

me·nis·cus

, pl. menisci (mĕ-niskŭs, -kī) [TA]
1. [TA] Any crescent-shaped structure.
2. A crescent-shaped fibrocartilaginous structure of the knee, the acromio- and sternoclavicular and the temporomandibular joints.
3. The crescentic curvature of the surface of a liquid standing in a narrow vessel.
Synonym(s): meniscus lens.
[G. mēniskos, crescent]
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.
The first generation of Maksutov-Cassegrains, popularized by John Gregory in the late 1950s employed only three spherical surfaces: the primary mirror, and the front and rear surfaces of the meniscus lens. The secondary mirror is merely an aluminized spot on the rear surface of the meniscus.