caustic surface

(optics) A surface to which rays reflected or refracted by another surface are tangents.

Japanese Meaning

光学において、反射や屈折された光線が接する曲面

曲面鏡からの光を追跡すると、その鏡で反射または屈折された光線が接する包絡面が壁に明るく複雑な模様を作った。

Sense（1）

(optics) A surface to which rays reflected or refracted by another surface are tangents.

Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction.

caustic surfaces

（ plural ）