noun
plano-convex lens
A lens with one flat surface and one convex surface. Used in optics and photography.
See also: 平凹レンズ
平凸レンズは、平行光線を一点に集めるのに使われる。
A plano-convex lens is used to focus parallel light rays to a point.
A plano-concave lens, which has one flat and one concave surface, diverging light instead of converging it.
Compound of 平 (flat) + 凸 (convex) + レンズ (lens).