plano-concave

American  

[pley-noh-kon-keyv, -kon-keyv] / ˌpleɪ noʊˈkɒn keɪv, -kɒnˈkeɪv /

adjective

Optics.

1. pertaining to or noting a lens that is plane on one side and concave on the other.

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plano-concave British  

/ ˌpleɪnəʊˈkɒnkeɪv /

adjective

1. (of a lens) having one side concave and the other side plane

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Etymology

Origin of plano-concave

First recorded in 1685–95; plano- ¹ + concave

Example Sentences

There, two lenses were made, one plano-convex, and the other plano-concave, and these were placed in a tube made of sheet copper.

From Little Journeys to the Homes of the Great - Volume 12 Little Journeys to the Homes of Great Scientists by Hubbard, Elbert

E is a double concave, being, in all respects, the reverse of D. C is a plano-concave, flat on one side, and concave on the other.

From Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained by Jones, Thomas P.

What Hall and Dollond did was to make the outer or crown lens of the objective as before, and place behind it a plano-concave lens of dense flint glass.

From Astronomy: The Science of the Heavenly Bodies by Todd, David Peck

Lens, 184. concave, 184. convex, 184. meniscus, 184. plano-concave, 184. plano-convex, 184.

From Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained by Jones, Thomas P.

The chromatic combination consists of a convex lens of crown backed by a concave, or plano-concave, lens of flint.

From Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers by Serviss, Garrett Putman