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(Science: microscopy) In optics, an optical surface which has been made substantially flat, the degree of flatness depending upon the performance required.

A plano-convex lens is a positive lens with one surface flat and the other convex. In the dictionary, plano is given only as a combining form, but in practical optics it is often used alone to denote any particularly flat surface-- that has been worked flat.

See: optical flat.

Origin: L. Planus.