| plano | <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. (04 Mar 1998) |
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