Snell's law
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Snell's law 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 isotr
Reproduction of a page of Ibn Sahl's manuscript showing his discovery of the law of refraction
Ibn Sahl (mathematician)
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Ibn Sahl was a Persian mathematician and physicist of the Islamic Golden Age, associated with the Buyid court of Baghdad. Despite attempts by professionals in the field of onomastics, neither his coun
Snell's law
…his data to fit theory (see: confirmation bias). The law was eventually named after Snell, although it was first discovered by the Persian scientist Ibn Sahl, at Baghdad court in 984. In the manuscript On Burning Mirrors and Lenses, Sahl used the law to derive lens shapes that focus light with no geometric…
Gravure originale du compas parfait par Abū Sahl al Qūhī