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planoconcave

A ราบ ข้าง หนึ่ง เว้า ข้าง หนึ่ง 

 

Oxford Dictionary

planoconcave

plano |con ¦cave |ˌpleɪnəʊˈkɒnkeɪv | ▶adjective (of a lens ) with one surface plane and the opposite one concave.