plano concave

plano-concave

[pley-noh-kon-keyv, -kon-keyv]
adjective Optics.
pertaining to or noting a lens that is plane on one side and concave on the other.

Origin:
1685–95; plano-1 + concave

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World English Dictionary
plano-concave (ˌpleɪnəʊˈkɒnkeɪv)
 
adj
(of a lens) having one side concave and the other side plane

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