plano-concave

[ pley-noh-kon-keyv, -kon-keyv ]

Phonetic (Standard)IPA

adjective

, Optics.

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

plano-concave

/ ˌpleɪnəʊˈkɒnkeɪv /

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

The achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass.

And the correction is produced by the same plano-concave lens as that which corrects the spherical aberration.

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

If one of the radii becomes infinite, the lens is plano-concave (fig. 9, 5).

I have made another only with a plano concave, without any kind of reflection, divers also by means of reflection.

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