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Wed 20 Apr, 2005 10:07 am
A parabola has the property that all axial rays reflect converging to a single point, its focus.
What is the shape of the locus in a catenary ? Cannot be a point; is it a line, or a circle, or a ... ?
In other words; Where do the axial rays reflected on a catenary intersect ?
I don't think it's anything.
I don't know, but a catenary is the shape of a hanging chain (assuming perfect flexibility).