: Astronomie: Snell's law

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Snell's law

Snell's law (also known as Snell–Descartes law and ibn-Sahl law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air. This law was named after the Dutch astronomer and mathematician Willebrord Snellius (also called Snell). (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Snell%27s_law)

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