Caustic (optics)
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In optics, a caustic or caustic network is the envelope of light rays which have been reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surfac
Caustics from a glass of water
Caustics made by the surface of water
Circle of confusion
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In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as disk of confusion, circle
Caustic (optics)
…Caustic (mathematics) Circle of confusion Focus (optics…
An early calculation of CoC diameter ("indistinctness") by "T.H." in 1866.