Everytime I go to grab a mug I see a shape in the bottom, which looks oddly like the cardioid. Is there some mathematical/physics answer to this phenomenon?
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It is called a "caustic." https://en.wikipedia.org/wiki/Caustic_%28optics%29 – David G. Stork Dec 07 '20 at 01:38
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5Does this answer your question? Cardioid in coffee mug? – Ottavio Dec 07 '20 at 01:48