Origin of plano-concave
Examples from the Web for plano-concave
Historical Examples of plano-concave
If one of the radii becomes infinite, the lens is plano-concave (fig. 9, 5).
The achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass.Physics
Willis Eugene Tower
The chromatic combination consists of a convex lens of crown backed by a concave, or plano-concave, lens of flint.Pleasures of the telescope
Plano-concave and double concave lenses produced similar effects.Biographies of Distinguished Scientific Men