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plano-concave

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plano-concave
ˌplano-ˈconcave, a. [f. plano-1 + concave.] Having one surface plane and the opposite one concave, as a lens.1693 E. Halley in Phil. Trans. XVII. 961 Whether the Lens be..Plano-Convex or Plano-Concave. 1807 Herschel ibid. XCVII. 183 The plain side of a plano-concave, or plano-convex lens. 1881 Le Co... Oxford English Dictionary
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Plano-convex ingot
Plano-convex ingots are lumps of metal with a flat or slightly concave top and a convex base. A slightly concave upper surface can be produced if the top of the ingot cools more slowly than the bottom. wikipedia.org
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Coma (optics)
These work by means of a dual lens system of a plano-convex and a plano-concave lens fitted into an eyepiece adaptor which superficially resembles a Barlow wikipedia.org
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plano
plano, a. (ˈpleɪnəʊ) [f. plano-1.] Of a surface of a lens: flat.1950 Jrnl. Optical Soc. Amer. XL. 523/1 The plano surfaces can introduce central coma by being tilted. 1962 L. S. Sasieni Princ. & Pract. Optical Dispensing x. 268 Many modern trial cases are made with plano-convex and plano-concave sph... Oxford English Dictionary
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convexo-
convexo- (kənˈvɛksəʊ) In combination = Convexly, convex and ―, as in convexo-concave, convex on one side and concave on the other, and thickest in the centre (cf. concavo-convex); of the form of a meniscus; convexo-convex, convex on both sides; convexo-plane, convex on one side, and flat on the othe... Oxford English Dictionary
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Astele speciosa
The whorls are plano-concave, sculptured with transverse subgranulate alternately smaller and larger lirae. The granules are reddish brown. wikipedia.org
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Astralium haematragum
The base of the shell is plano-concave, concentrically squamose-lirate. The aperture is transverse, channelled at the carina. wikipedia.org
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Plainview point
The point was named in 1947 after the discovery of a large cache of unfluted, lanceolate spear tips with concave bases that were found in a Bison antiquus Description Plainview is described as having parallel or convex sides with a concave base. It is considered to be a Plano point. wikipedia.org
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Trochus chloromphalus
The body whorl is carinated, plano-concave beneath, with 7 concentric lirae, slightly or not at all granulose, separated by obliquely striated interstices wikipedia.org
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Tegula excavata
The body whorl is acutely carinated at the periphery, flat or plano-concave beneath, concentrically lirate. wikipedia.org
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Precision glass moulding
Possible preforms are spherical (ball), near spherical (gob), plano-plano, plano-convex, plano-concave, biconvex and biconcave blanks. Ground and Polished Plano-Plano Preform “As a lens changes to negative in power biconcave, plano-concave, and meniscus where the concave side is stronger wikipedia.org
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Rochia virgata
The spire is somewhat attenuated and concave on its upper portion, then slightly convex. The sutures are linear. The 10 whorls are nearly planulate. The base of the shell is plano-concave, indented in the center, finely, densely lirate. wikipedia.org
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Stokes lens
The Stokes lens also known as variable power cross cylinder lens, in its standard version, is a lens combination consisted of equal but opposite (one plano-convex and other plano-concave) power cylindrical lenses attached together in a way so that the lenses be rotated in opposite directions. wikipedia.org
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Pecten excavatus
Shell description In this species, the valves are greatly inequal and plano-convex in shape: the right valve is highly convex, and the left valve is correspondingly concave, an arrangement unusual within the scallop family. wikipedia.org
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Folsom point
Description The points are bifacially worked and have a symmetrical, leaf-like shape with a concave base and wide, shallow grooves running almost the In the Great Plains area, the use of Folsom points was supplanted over time by Plano points of the various Plano cultures. wikipedia.org
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