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What is a catacaustic?

What is a catacaustic? Here are some definitions.

Noun
  1. a caustic curve formed by light reflecting from a curved surface
  2. (mathematics) the envelope of all rays that emanate from a specified point (the radiant point) and reflect from a given curve; the evolute of the orthotomic
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He also studied catacaustic curves in 1682, these being the envelope of light rays emitted from a point source after reflection from a given curve.
Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction.

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