Foci
[S1 Science & Maths: Reflection (and property of ellipses)]
You may have found a puzzle like this while digging around older newspaper articles on mathematics. If not, well, here's the rundown:
The focal points of the ellipse is the primary reason why Roger Penrose's room works as prescribed. Think of this as a challenge, for those who are mathematically inclined: How would you find and locate the focal point of an ellipse?
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