• Do not the Rays which differ in Refrangibility differ also in Flexibity; and are they not by their different Inflexions separated from one another, so as after separation to make the Colours in the three Fringes above described? And after what manner are they inflected to make those Fringes?

    Sir Isaac Newton (2012). “Newton's Philosophy of Nature: Selections from His Writings”, p.135, Courier Corporation
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