Definition of Plano concave. Meaning of Plano concave. Synonyms of Plano concave

- lens with two concave surfaces is biconcave (or just concave). If one of the surfaces is flat, the lens is plano-convex or plano-concave depending on the...
- telescopes. These work by means of a dual lens system of a plano-convex and a plano-concave lens ****ed into an eyepiece adaptor which superficially resembles...
- a Galilean telescope. It used a convergent (plano-convex) objective lens and a divergent (plano-concave) eyepiece lens (Galileo, 1610). A Galilean telescope...
- astigmatism. This lens consisted of two cylindrical lenses, one plano-convex and one plano-concave, which be rotated in opposite directions. In 1887 Edward Jackson...
- single divergent (plano-concave) lens, in front of a frame, when close to the eye, acts as a viewfinder. Adding a convergent (plano-convex) lens makes...
- lens with two concave surfaces is biconcave (or just concave). If one of the surfaces is flat, the lens is plano-convex or plano-concave depending on the...
- convex or conico-convex expanding and flattening with age to become plano-concave with or without a slight umbo. The surface is white and covered with...
- invented in 1849 by Carl Kellner. In this arrangement, the eye lens is a plano-concave/ double convex achromatic doublet (the flat part of the former facing...
- sometimes paper-thin. The centra were plano-concave, flat to weakly convex at the front and deeply cupped (or concave) at the back, similar to Ceratosaurus...
- Possible preforms are spherical (ball), near spherical (gob), plano-plano, plano-convex, plano-concave, biconvex and biconcave blanks. Ball and gob-blanks do...