“Opticks was out of harmony with the ideas of 19th-century physics. …an exposition of the "wrong" (i. e., corpuscular) theory of light,—even though it also contained many of the basic principles of the "correct" (i. e., wave) theory. Not only had Newton erred in his choice… but also he apparently had found no insuperable difficulty in simultaneously embracing features of two opposing theories. …by adopting a combination of the two theories at once, he had violated one of the major canons of 19th-century physics… Today our point of view is influenced by the theory of photons and matter waves, or the… complementarity of Niels Bohr; and we may read with a new interest Newtons ideas on the interaction of light and matter or his explanation of the corpuscular and undulatory aspects of light.”

—  I. Bernard Cohen

I. Bernard Cohen, Preface to Opticks by Sir Isaac Newton (1952)

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I. Bernard Cohen9
American historian of science 1914–2003

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