convex lens
(optics) A lens having at least one convex surface, such that light passing through it may be brought to a focus.
The capital city of Panama. / A city, the county seat of Bay County, Florida, United States.
A county-level city in Zhanjiang, Guangdong, China
(music) A drum (membranophone) that has two heads and produces sound through two pellets, tied to the body of the drum and manipulated so as to strike the heads.
物理の先生は、凸レンズが太陽光を集めて火を起こす様子を実演した。
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DiQt（ディクト）
無料
★★★★★★★★★★
