凸とつ

na-adjective, noun which may take the genitive case particle 'no'

convex

Used in geometry, mathematics, and technical contexts to describe a surface or shape that curves outward. Often appears in compounds like 凸レンズ (convex lens) or 凸面 (convex surface).

• このレンズは凸とつレンズです。

  This lens is a convex lens.

• 凸とつ面めん鏡きょうは光ひかりを広ひろげる。

  A convex mirror spreads light.