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Ellipse Reflection Property

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Phil Todd

@polymnia

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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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