Caustic (optics)

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Caustics made by the surface of water.

In optics, a caustic is the envelope of light rays reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surface. The caustic is a curve or surface to which each of the light rays is tangent, defining a boundary of an envelope of rays as a curve of concentrated light.

  1. ​​Architectural Caustics​​
  2. ​​Caustic Engineering​​