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A: The bottom of a concave meniscus. B: The top of a convex meniscus . In physics (particularly fluid statics ), the meniscus ( pl. : menisci , from Greek 'crescent') is the curve in the upper surface of a liquid close to the surface of the container or another object, produced by surface tension .
English: Meniscus lenses have one concave surface (illustrated here on the right side) and one convex surface (illustrated here on the left side). The positive (converging) meniscus lens has a thicker center than edge, and represents the case where the convex surface (shown in green) has a smaller radius than the concave surface (shown in red).
Plasmat lens. The Plasmat lens is a widely used and long-established lens type invented by Paul Rudolph in 1918, especially common in large-format photography. It provides high correction of aberrations with a moderate maximum aperture (e.g. f /5.6). It is a specific instance of the Dagor type double-meniscus anastigmat.
1 - Symmetrical double convex lens. 2 - Asymmetrical double-convex lens 3 - Plano- convex lens. 4 - Positive meniscus lens. Diverging or negative lenses. 5 - Symmetrical biconcave lens. 6 - Asymmetrical biconcave lens. 7 - Plano-concave lens. 8 - Negative meniscus lens. ʟ̩ Location of the principal planes depending on the geometry of the lens ...
A lens with one convex and one concave side is convex-concave or meniscus. Convex-concave lenses are most commonly used in corrective lenses, since the shape minimizes some aberrations. For a biconvex or plano-convex lens in a lower-index medium, a collimated beam of light passing through the lens converges to a spot (a focus) behind
Meniscus may refer to: Meniscus (anatomy), crescent-shaped fibrocartilaginous structure that partly divides a joint cavity; Meniscus (liquid), a curve in the upper surface of liquid contained in an object; Meniscus (optics), a type of optical lens; Meniscus, a genus of bacteria
Diagram of Petzval's 1841 portrait lens - crown glass shaded pink, flint glass shaded blue. The lenses of the very earliest cameras were simple meniscus or simple bi convex lenses. It was not until 1840 that Chevalier in France introduced the achromatic lens formed by cementing a crown glass bi-convex lens to a flint glass plano
Diagram of Axicon and resulting Bessel Beam. An axicon is a specialized type of lens that has a conical surface. An axicon transforms a laser beam into a ring shaped distribution. [1] They can be convex or concave and be made of any optical material. The combination with other axicons or lenses allows a wide variety of beam patterns to be ...