Caustic surface

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Related to Caustic surface: Caustic curve
(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.
etc. See under Caustic, Heating, etc.

See also: Caustic, Surface

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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"A light beam emitted from any point on a caustic surface gets focussed by the black hole into a bright cusp of light at a given point," James continued.
Naturally, we would like to explore the caustic surface, which is the evolute of an orthotomic surface, or the envelope of an orthotomic surface normals.
The bounding surface separating the regions where the light rays are observed and not observed is called the caustic surface. If a virtual screen is placed at a distance [z.sub.0] from the specimen front surface, a dark region called the shadow-spot, surrounded by a bright curve called the caustic curve is observed.