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canvas prints book canvas prints rainbow canvas prints prism canvas prints light canvas prints diagram canvas prints equipment canvas prints optics canvas prints physics canvas prints history canvas prints technology canvas prints astronomy canvas prints black-and-white canvas prints monochrome canvas prints 18th century canvas prints 1704 canvas prints

photographs book photos rainbow photos prism photos light photos diagram photos equipment photos optics photos physics photos history photos technology photos astronomy photos black-and-white photos monochrome photos 18th century photos 1704 photos

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Newton's rainbow explanation. Diagrams explaining the optics of a rainbow, by the English physicist, mathematician and astronomer Sir Isaac Newton (1643-1727). The diagrams were published in his famous work Opticks (1704). The main diagram shows the refraction and reflection of sunlight (S) inside raindrops (circles). In the main rainbow (bottom, E and F) the rays are refracted twice and reflected once. In the secondary rainbow (upper, G and H) the rays are refracted twice and reflected twice. This is also shown in the surrounding diagrams. This causes the secondary rainbow to be both fainter, and have its colours reversed. This explanation dates back before Newton to Theodoric of Freiberg in 1307.

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