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

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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.
We use the following example to demonstrate that a caustic surface is a natural extension from its caustic curve in 2-D.
The mathematical condition for the caustic surface to exist is that the Jacobian determinant of the mapping equation be zero.