Inverted image. La dioptrique (Dioptrique, Optics, or Dioptrics), is a short treatise published in 1637 included in one of the Essays written with Discourse on the Method by Rene Descartes. In this essay Descartes uses various models to understand the properties of light. This essay is known as Descartes' greatest contribution to optics, as it is the first publication of the Law of Refraction. René Descartes (March 31, 1596 - February 11, 1650) was a French mathematician, philosopher and physiologist.

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René Descartes, Optics, Inverted Image, 1637

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