burning lens
The act by which something is stoked.
A large convex lens or concave mirror that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface.
Possessing the qualities of a rictus.
A surname.
日光を一点に集中させて枯れ葉の山に着火するために、大型の凸レンズを使った。
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