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Snell’s law

Snell's law [ snélz làw ]


noun 
Definition:
 
law governing refraction angle: the law stating that for a light ray passing between two media the ratio of the sines of the angle of incidence and the angle of refraction is a constant

[Late 19th century. After Willebrord Van Roijen Snell (1591-1626), Dutch astronomer and mathematician]
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