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    "title": "Newton: white light as a mixture of differently refracted rays",
    "summary": "Newton used prism arrangements to separate sunlight and test selected parts of its spectrum with a second prism. Different parts retained different refractive behavior, while bringing the separated light together reproduced white light.\n\nThe experiments distinguish a heterogeneous incident beam from colours created solely by an imperfect prism. Selection with apertures and another prism tests the separated components; lens recombination tests the mixture account of white light. The paper asks for careful separation and dark-room controls. Newton's mechanics and calculus remain different contributions, and later optical investigations retain their own authorship.",
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        "title": "Isaac Newton, A Letter ... containing his New Theory about Light and Colors, Philosophical Transactions 80 (19 February 1671/2), 3075–3087; Newton Project transcription",
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            "citation": "Isaac Newton, A Letter ... containing his New Theory about Light and Colors, Philosophical Transactions 80 (19 February 1671/2), 3075–3087; Newton Project transcription",
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      "scope": {
        "description": "The target is the 1672 letter's prism selection and recomposition evidence, based on experiments reported as begun in 1666. Its historical statements about all colours, all materials and impossible lens correction are not adopted as modern universal laws. This does not establish corpuscular light, all colour perception or the later full Opticks program.",
        "domain": "Optics and colour"
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        {
          "citation": "Isaac Newton, A Letter ... containing his New Theory about Light and Colors, Philosophical Transactions 80 (19 February 1671/2), 3075–3087; Newton Project transcription",
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      "statement": "# Newton: white light as a mixture of differently refracted rays\n\nNewton used prism arrangements to separate sunlight and test selected parts of its spectrum with a second prism. Different parts retained different refractive behavior, while bringing the separated light together reproduced white light.\n\nThe experiments distinguish a heterogeneous incident beam from colours created solely by an imperfect prism. Selection with apertures and another prism tests the separated components; lens recombination tests the mixture account of white light. The paper asks for careful separation and dark-room controls. Newton's mechanics and calculus remain different contributions, and later optical investigations retain their own authorship.\n\n## Scientific scope\n\nThe target is the 1672 letter's prism selection and recomposition evidence, based on experiments reported as begun in 1666. Its historical statements about all colours, all materials and impossible lens correction are not adopted as modern universal laws. This does not establish corpuscular light, all colour perception or the later full Opticks program.\n\n## People and systems\n\nIsaac Newton\n\n\n\n## Original sources\n\n- [Isaac Newton, A Letter ... containing his New Theory about Light and Colors, Philosophical Transactions 80 (19 February 1671/2), 3075–3087; Newton Project transcription](https://newtonproject.ox.ac.uk/view/texts/diplomatic/NATP00006)\n",
      "summary": "Newton used prism arrangements to separate sunlight and test selected parts of its spectrum with a second prism. Different parts retained different refractive behavior, while bringing the separated light together reproduced white light.\n\nThe experiments distinguish a heterogeneous incident beam from colours created solely by an imperfect prism. Selection with apertures and another prism tests the separated components; lens recombination tests the mixture account of white light. The paper asks for careful separation and dark-room controls. Newton's mechanics and calculus remain different contributions, and later optical investigations retain their own authorship.",
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    "title": "Newton: white light as a mixture of differently refracted rays",
    "context": "Optics and colour",
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    "what_changed": "Selection with a second prism and recomposition organize white sunlight as a mixture with differing refractive behavior, instead of colours generated solely by the first prism.",
    "scope": "Selection with a second prism and recomposition organize white sunlight as a mixture with differing refractive behavior, instead of colours generated solely by the first prism. The target is the 1672 letter's prism selection and recomposition evidence, based on experiments reported as begun in 1666. Its historical statements about all colours, all materials and impossible lens correction are not adopted as modern universal laws. This does not establish corpuscular light, all colour perception or the later full Opticks program.",
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    "references": [
      {
        "title": "Isaac Newton, A Letter ... containing his New Theory about Light and Colors, Philosophical Transactions 80 (19 February 1671/2), 3075–3087; Newton Project transcription",
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