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	Snell's law - Wikipedia, the free encyclopedia
		Snell's law is the simple formula used to calculate the refraction of light when travelling between two media of differing refractive index.
		Snell's law may be derived from Fermat's principle, which states that the light travels the path which takes the least time.
		Snell's law was first discovered and described by Ibn Sahl in a manuscript written c.
	en.wikipedia.org /wiki/Snell's_law (821 words)

	Willebrord Snell
		Willebrord Snell (1580 – October 30, 1626), also known as Snell van Royen or Snellius, was a Dutch astronomer and mathematician, most famous for the law of refraction now known as Snell's law.
		In 1615 he planned and carried into practice a new method of finding the radius of the earth, by determining the distance of one point on its surface from the parallel of latitude of another, by means of triangulation.
		His work Eratosthenes Batavus ("The Dutch Eratosthenes"), published in 1617, describes the method and gives as the result of his operations between Alkmaar and Bergen op Zoom—two towns separated by one degree of the meridian, which he measured to be equal to 117,449 yds (107.395 km).
	publicliterature.org /en/wikipedia/w/wi/willebrord_snell.html (255 words)

	Willebrord Snell: biography and encyclopedia article (Site not responding. Last check: 2007-11-07)
		Snell was born at Leiden (Leiden: A city in the western Netherlands; residence of the Pilgrim Fathers for 11 years before they sailed for America in 1620).
		In 1613 he succeeded his father Rudolph Snell (1546—1613) as professor of mathematics (mathematics: A science (or group of related sciences) dealing with the logic of quantity and shape and arrangement) in the University of Leiden (University of Leiden: more facts about this subject).
		Snell was also a distinguished mathematician, producing a new method for calculating π (π: more facts about this subject) — the first such improvement since ancient times.
	www.absoluteastronomy.com /reference/willebrord_snell (241 words)

	snell (Site not responding. Last check: 2007-11-07)
		Snell began to study math at a very young age as he was very interested in it.
		Willebrord's biggest contribution to science, however, is the law of refraction, even though it wasn't published until almost 70 years after he died.
		Willebrord van Roijen Snell died at the young age of 46 on the 30 of October in 1626.
	www.qerhs.k12.nf.ca /projects/physics/snell.html (488 words)

	Snell, Willebrord (Site not responding. Last check: 2007-11-07)
		Snell was born in Leiden, where he studied and eventually became professor.
		Snell developed the method of triangulation in 1615, starting with his house and the spires of nearby churches as reference points.
		Snell's law was published by French mathematician Descartes in 1637.
	www.cartage.org.lb /en/themes/Biographies/MainBiographies/S/snell_1/1.html (174 words)

	Willebrord Snell History Summary (Site not responding. Last check: 2007-11-07)
		Willebrord Snell is remembered for discovering the law of refraction that bears his name.
		Snell was born in 1580 in Leiden, Netherlands.
		Snell's years of research revealed that it was the ratio of the sines of the angles of the incident and refracted rays to the normal that remains constant.
	www.bookrags.com /history/sciencehistory/willebrord-snell-scit-031234 (624 words)

	Search Results for "Snell"
		Snell, Willebrord, (vil´brort snel, sneles) (KEY), 1591-1626, Dutch mathematician.
		This was similar to the H-2 complex in mice identified by George Snell.
		This law, credited to Willebrord Snell, states that the ratio of the sine of the angle of incidence, i, to the sine...
	www.bartleby.com /cgi-bin/texis/webinator/sitesearch?FILTER=col65&query=Snell (239 words)

	Işık (Site not responding. Last check: 2007-11-07)
		Willebrord Snell studied law at the University of Leiden but was very interested in mathematics and taught mathematics even while he studied law.
		Snell's father, Rudolph Snell (1546-1613), was professor of mathematics at Leiden and, in 1604, Willebrord visited Switzerland with his father.
		Snell studied the loxodrome, the path on the sphere that makes constant angle with the meridians.
	www.kameraarkasi.org /light/mucitler/snell.html (239 words)

	WILLEBRORD SNELL - LoveToKnow Article on WILLEBRORD SNELL (Site not responding. Last check: 2007-11-07)
		In 1613 he succeeded his father Rudolph Snell (1546-1613) as professor of mathematics in the university of Leiden.
		In 1615 he planned and carried into practice a new method of finding the dimensions of the earth, by determining the distance of one point on its surface from the parallel of another, by means of a triangulation.
		His work Eratosthenes Batavus, published in 1617, describes the method and gives as the result of his operations between Alkmaar and Bergen-opZoom a degree of the meridian equal to 55,100 toises= 117,449 yds.
	85.1911encyclopedia.org /S/SN/SNELL_WILLEBRORD.htm (237 words)

	Ray Optics,
		Willebrord Snell discovered the law of refraction which is now termed Snell's law.
		Truly, a complete understanding of Snell's law does not define the index of refraction of a substance as the ratio of the sine of the angle of incidence to the sine of the angle of refraction.
		It defines the index of refraction as the speed of the light ray in free space divided by the speed of the light ray in the substance.
	id.mind.net /~zona/mstm/physics/light/rayOptics/refraction/snellsLaw/snellsLaw1.html (882 words)

	Willebrord Snell Biography / Biography of Willebrord Snell World of Mathematics Biography
		Willebrord Snell is best known for his discovery regarding the refraction of light rays.
		This discovery, known as Snell's law, demonstrates that when a ray of light passes from a thinner element such as air, into a denser element, such as water or glass, the angle of the ray bends to the vertical.
		Snell's law--a key revelation in the science of optics--was formulated after much experimentation in 1621.
	www.bookrags.com /biography-willebrord-snell-wom (246 words)

	Learn more about Willebrord Snell in the online encyclopedia. (Site not responding. Last check: 2007-11-07)
		Learn more about Willebrord Snell in the online encyclopedia.
		Willebrord Snell (1591—1626), also known as Snell van Royen or Snellius, was a Dutch astronomer and mathematician, most famous for the law of refraction now known as Snell's law.
		Snell was also a distinguished mathematician, producing a new method for calculating &pi -- the first such improvement since ancient times.
	www.onlineencyclopedia.org /w/wi/willebrord_snell.html (340 words)

	page3
		Willebrord Snell was an early seventeenth-century Dutch mathematician
		Snell's law of refraction is his most important contribution to science.
		Snell's law is often stated in terms of the indexes of refraction of the two
	www.k12.nf.ca /gc/scienceweb/physicsweb/Physics2204/studentprojects/Project08/page3.htm (807 words)

	New Scientist Premium- Rainbow's bend - Opinion
		The law of refraction, which applies to other types of waves besides light, is named after Dutch astronomer Willebrord Snell, who is credited with its discovery in 1621.
		Snell's law is a tiny thing, with just half a dozen mathematical symbols.
		It relates the angles of the beam before and after refraction to a number—the refractive index-which is characteristic of the material.
	www.newscientist.com /article/mg17123034.200.html (258 words)

	Willebrord Snell: bio and encyclopedia article (Site not responding. Last check: 2007-11-07)
		Snell was born at Leiden (A city in the western Netherlands; residence of the Pilgrim Fathers for 11 years before they sailed for America in 1620)
		In 1613 he succeeded his father Rudolph Snell (1546—1613) as professor of mathematics (A science (or group of related sciences) dealing with the logic of quantity and shape and arrangement)
		Snell was also a distinguished mathematician, Exception Handler: No article summary found.
	www.absoluteastronomy.com /ref/willebrord_snell (1041 words)

	Review Single
		The physicist Willebrord Snell (1580-1626) found polygons which better approximated the perimeter of circles than do inscribed and circumscribed polygons.
		Explanation: Willebrord Snell studied law at the University of Leiden but was very interested in mathematics and taught mathematics even while he studied law.
		An ancestor of mine, Brinkerus, was the one who discovered that the angle of the dangle equals the square of the hair.
	www.qod.com /review_single.phtml?d=2004-11-01 (927 words)

	The Science Bookstore - Chronology (Site not responding. Last check: 2007-11-07)
		Snell, W. Willebrord Snell discovers that light moving from rarer to denser medium is bent towards vertical [Snell's Law]
		Snell, W. Willebrord Snell discovers and states his law of refraction
		BARUJ BENACERRAF, JEAN DAUSSET and GEORGE D. SNELL for their discoveries concerning genetically determined structures on the cell surface that regulate immunological reactions.
	www.thesciencebookstore.com /chron.asp?searchstring=Snell (111 words)

	JOHN SNELL - LoveToKnow Article on JOHN SNELL
		(1629-1679), founder of the Snell exhibitions at Oxford, was born in 1629 in Ayrshire, Scotland, the son of a flsmith.
		He joined the royalists during the civil war, and fought in several battles, including Worcester.
		The Court of Chancery decided in 1693 that Balliol should receive the beneficiaries.
	1911encyclopedia.org /S/SN/SNELL_JOHN.htm (150 words)

	Snell's law -- Britannica Student Encyclopedia (Site not responding. Last check: 2007-11-07)
		This law was discovered in 1621 by the Dutch astronomer and mathematician Willebrord van Roijen Snell (1580–1626; also called Snellius).
		One ray, called the ordinary ray, is in the plane containing the incident ray and the normal to the surface.
		In 1621 the Dutch scientist Willebrord Snell discovered that when a light ray passes from one medium to another, there is a constant ratio between the sine of the angle of incidence and the sine of the angle of refraction.
	www.britannica.com /ebi/article-9068375 (805 words)

	Why You Don’t Believe Fermat’s Principle
		The relationship between the angles a and b was not known, until Willebrord Snell discovered in 1621 that the sines of the angles maintain a constant proportion for any given pair of media.
		Snell's discovery was welcomed by René Descartes (1596-1650), the leader of a philosophical school which proposed that all natural phenomena could be explained by mechanical causes.
		In fact, Descartes so welcomed the discovery that he claimed it for his own, and his writings being more widely read than Snell's, Descartes was thought to be the discoverer of the law, until the matter was cleared up after his death.
	www.21stcenturysciencetech.com /articles/fall01/fermat/Fermat.html (1549 words)

	Snell
		Snell also improved the classical method of calculating approximate values of π by polygons.
		Using his method 96 sided polygons give π correct to 7 places while the classical method yields only 2 places.
		, a basis of modern geometric optics, in 1621, he did not publish it and only in 1703 did it become known when Huygens published Snell's result in Dioptrica.
	www-groups.dcs.st-and.ac.uk /~history/Biographies/Snell.html (256 words)

	Optics 5
		ay optics may be said to have begun as a science with the discovery of the law of refraction by Willebrord Snell in 1621 and its description in mathematical terms by René Descartes in 1637.
		In 1657, Fermat showed that the law is consonant with the "principle of least time," with light traveling more slowly in the denser medium.
		Although he discovered the law of refraction, he did not publish the result and his priority was not recognized until Huygens mentioned Snell’s discovery in his work some seventy years later.
	www.ee.umd.edu /~taylor/optics5.htm (826 words)

	SNELL, WILLEBRORD (159... - Online Information article about SNELL, WILLEBRORD (159... (Site not responding. Last check: 2007-11-07)
		SNELL, WILLEBRORD (1591-1626), commonly known as SNELLIUS, Dutch astronomer and mathematician, was See also:
		PROFESSOR (the Latin noun formed from the verb profiteri, to declare publicly, to acknowledge, profess)
		measures indicated by himself.) Snell also distinguished himself as a mathematician, and discovered the See also:
	encyclopedia.jrank.org /SIV_SOU/SNELL_WILLEBRORD_1591_1626_.html (382 words)

	References for Snell (Site not responding. Last check: 2007-11-07)
		F Hallyn, Kepler, Snell and the law of refraction (Dutch), Med.
		W B Joyce and A Joyce, Descartes, Newton, and Snell's law, J.
		C De Waard, Willebrord Snell, Nieuw Nederlandsch biographisch woordenboek 7 (Leiden, 1927), 1155-1163.
	www-gap.dcs.st-and.ac.uk /~history/References/Snell.html (101 words)

	Note-A-Rific: Snell's Law (Site not responding. Last check: 2007-11-07)
		The Law of Refraction (AKA “Snell’s Law) in its basic form allows us to do calculations of how a beam will bend when it moves from one medium to another.
		The formula for Snell’s Law doesn’t look like this in your data sheet, since we’ve expanded it so you can do more things.
		The weird thing about this formula is that you don’t use it all at once in a question.
	www.studyphysics.ca /20/unit4/geometric/refraction/snell/note.htm (872 words)

	Precalculus Enhanced with Graphing Utilities 2E Chapter 1 -- Internet Explorations (Site not responding. Last check: 2007-11-07)
		In 1621, the basic law of refraction, was proposed by the Dutch scientist Willebrord Snell.
		The law of refraction and the law of reflection provide the keys to the modern explanation for the formation of rainbows.
		The algebraic expression for Snell's Law looks similar the law of sines except that the constants no longer refer to the lengths of the sides of a triangle, but instead refer to a "refractive index".
	cwx.prenhall.com /bookbind/pubbooks/sullivan11/chapter1/essay9/deluxe-content.html (548 words)

	AllRefer.com - Willebrord Snell (Mathematics, Biography) - Encyclopedia
		AllRefer.com - Willebrord Snell (Mathematics, Biography) - Encyclopedia
		Willebrord Snell[vil´ubrOrt snel, snelEus] Pronunciation Key, 1591–1626, Dutch mathematician.
		More articles from AllRefer Reference on Willebrord Snell
	reference.allrefer.com /encyclopedia/S/Snell.html (150 words)

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