plano, a.
(ˈpleɪnəʊ)
[f. plano-1.]
Of a surface of a lens: flat.
| 1950 Jrnl. Optical Soc. Amer. XL. 523/1 The plano surfaces can introduce central coma by being tilted. 1962 L. S. Sasieni Princ. & Pract. Optical Dispensing x. 268 Many modern trial cases are made with plano-convex and plano-concave spheres... The powers are engraved sometimes on the plano side of the convex and on the concave side of the concave. |