Euclid's Muse

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Ellipse Reflection Property

Profile picture of Phil Todd

Phil Todd



One definition of an ellipse is as the locus of points the sum of whose distance from two fixed points (the foci) is constant.

This gives you a way to draw the ellipse with two pins and a piece of string.

Here we relate that definition to the focal property: that light emanating from one focus reflects to the other focus.

Tags: ellipse, reflection
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