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Other names for Snell's Law are Descarte's Law, the Snell-Descartes law and the law of refraction.
You can find the names here : http://en.wikipedia.org/wiki/Snell's_law
Snell's Law was discovered by Willebrord Snell in the year 1621, but it was published by Christiaan Huygen (Christian Huyghens).
Snell's Law states that the ratio of the sines of the angles of incidence and refraction is equal.
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K. S Snell has written:
'New Mathematics Vol. 1'