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

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 Project Gutenberg

Two lenses only—a plano-convex and a plano-concave—were needed for the composition of each, and this simple principle is that still employed in the construction of opera-glasses.

From Project Gutenberg

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

From Project Gutenberg

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 Project Gutenberg

A. Thoma's Model, plano-concave, with handle adapted for clamping immediately to the knife carrier of the microtome, in box.

From Project Gutenberg