Explanation of principles of physics, 1725. The formation of a rainbow by dispersion and total internal reflection (top), and observing Newton's Rings (circular concentric interference fringes) (bottom). From Physices Elementa Mathematica by WJ Gravesande, a 'popular' explanation of his friend Isaac Newton's Principia. (London, 1725). (Photo by Oxford Science Archive/Print Collector/Getty Images)
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January 29th, 2021
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