| http://www.w3.org/ns/prov#value | - An example of a 1-parameter family of straight lines, which is not derived a priori as tangent lines to some curve is given by the reflection of a beam of parallel light in a curved mirror.So now I ask: the caustic curve we are talking about is the same as the curve that best known in physics is nothing but the envelope of the rays reflected from a curved surface, and coming from a light source?
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