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planoconvex

A ราบ ข้าง หนึ่ง นูน ข้าง หนึ่ง 

 

Oxford Dictionary

planoconvex

plano |con ¦vex |ˌpleɪnəʊˈkɒnvɛks | ▶adjective (of a lens ) with one surface plane and the opposite one convex.