Newton publishes Opticks

Newton investigated light in the 1660s and later communicated results to the Royal Society. Earlier explanations often treated colour as a modification of white light passing through a medium. The coloured band made by a prism required another analysis. Opticks appeared in English in 1704, organizing years of experiments. Apertures, prisms, screens, and their positions affected the results, so arrangements had to distinguish properties of incoming light from effects produced by instruments.

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Newton separated white light with a prism and passed a selected colour through another prism to examine whether it changed again. Different colours were refracted by different amounts, and separated components could be recombined into white light. The operations supported an account of white light as composed of distinct rays. Thin-film colours, reflection, and lenses also received detailed treatment. Diagrams and instructions allowed readers to inspect paths, distances, and screening conditions.

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Later editions added queries about light, matter, and interactions. Translations, repeated experiments, and disagreements carried the work through European scholarship. Wave and particle accounts continued to develop. Colour studies affected instrument design, theories of vision, and artistic discussion. The book also supplied a practical form of experimental record: specify a path of light, control conditions, and compare outcomes so that observers in separate places can check an arrangement.

References: [1]