American Heritage Dictionary of the English Language, 5th Edition
Snell Sentence Examples
Attempts have been made, principally founded on some remarks of Huygens, to show that Descartes had learned the principles of refraction from the manuscript of a treatise by Willebrord Snell, but the facts are uncertain; and, so far as Descartes founds his optics on any one, it is probably on the researches of Kepler.
He then returned to Balliol as a Snell exhibitioner; became vicar of High Ercall, Shropshire, in 1750; canon of Windsor, 1762; bishop of Carlisle, 1787 (and also dean of Windsor, 1788); bishop of Salisbury, 1791.
Since the angles of incidence and refraction are connected by the relation sin i=µ sin r (Snell's Law), µ being the index of refraction of the medium, then the problem may be stated as follows: to determine the value of the angle i which makes D = 2 (i - r) +n (7r - 2r) a maximum or minimum, in which i and r are connected by the relation sin i =µ sin r, µ being a constant.
In 1613 he succeeded his father Rudolph Snell (1546-1613) as professor of mathematics in the university of Leiden.