Refractive index info6/11/2023 Someone should make one for liquids and see what happens.ĭon't go in the water. The index of refraction is somewhat related to density, as one would expect. ![]() Today it is the form used by Descartes that is called Snell's law." Snell did discover the relationship but articulated it in a different way. "This form of Snell's law was actually published by René Descartes (1596–1650) France in La Dioptrique (1637). ![]() For some reason, the law named after the man is spelled incorrectly. "Although he discovered the law of refraction, a basis of modern geometric optics, in 1621, he did not publish it and only in 1703 did it become known when Huygens published Snell's law in Dioptrica." Snell also studied navigation and proposed the method of triangulation, which is the foundation of geodesy (the branch of mathematics dealing with the measurement of features on the Earth).
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