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         Snell Willebrord:     more detail
  1. Willebrord Snell: An entry from Gale's <i>Science and Its Times</i> by Stephen D. Norton, 2001
  2. Willebrord Snell: An entry from Gale's <i>Science and Its Times</i>

81. Snell, George Davis
encyclopediaEncyclopedia snell, George Davis. snell, George Davis, 1903–96,American immunologist, b. Bradford, Mass., Ph.D. Harvard, 1930.
http://www.infoplease.com/cgi-bin/id/A0845694

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Newsletter You've got info! Help Site Map Visit related sites from: Family Education Network Encyclopedia Snell, George Davis Snell, George Davis, , American immunologist, b. Bradford, Mass., Ph.D. Harvard, 1930. He was associated with the Jackson Laboratory in Bar Harbor, Maine from 1935 to 1973. His identification of the H-2 gene complex in mice helped make future organ transplants possible. Snell, Jean Dausset , and Baruj Benacerraf shared the 1980 Nobel Prize in Physiology or Medicine for their discoveries concerning the genetic basis of immune system responses. His work greatly increased the understanding of autoimmune diseases and histocompatability (see transplantation, medical

82. Snell's Law - Wikipedia
differing refractive index. Named for its discoverer, Dutch mathematicianWillebrord van Roijen snell (15801626). snell1.png. In the
http://www.wikipedia.org/wiki/Snells_law
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Snell's law
(Redirected from Snells law Snell's law is the simple formula used to calculate the refraction of light when travelling between two media of differing refractive index . Named for its discoverer, Dutch mathematician Willebrord van Roijen Snell In the diagram above, two media of refractive indices n (on the left) and n (on the right) meet at a surface or interface (vertical line). n n , and light has a slower phase velocity within the second medium. A light ray PO in the leftmost medium strikes the interface at the point O . From point O , we project a straight line at right angles to the line of the interface; this is known as the normal to the surface (horizontal line). The angle between the normal and the light ray

83. Rainbow Ray Diagram (Math)
Since snell's law always references the angle between the light ray and the linewhich is perpendicular to the surface where the light ray hits, this extended
http://www.webnexus.com/users/billv/rainbow/rainbowmath.html
The mathematics of Rainbows For the general physics of a rainbow, see my simple explanation . Here I want to actually trace the path the sunlight makes through a rain drop and derive a formula for the angle between the incoming sunlight and the refracted ray. I will assume a perfectly spherical rain drop. Before we trace a ray through the drop we need to cover a few basics. If you draw a line from the center of the circle through the surface it intersects the surface at 90 deg. Since Snell's law always references the angle between the light ray and the line which is perpendicular to the surface where the light ray hits, this extended radius line is the reference for measuring angles in Snell's law and also for the law of reflection, i.e., the angle of incidence equals the angle of reflection. So in the diagram above, the angle A is the incident angle and the angle B is the transmitted angle. If we assume the index of refraction for air is 1.0 and the index of refraction for the water is n then we have from Snell's law: sin(A) = n * sin(B) Also, the radius of the circle is

84. Optique 3 : Réflexion, Réfraction Et Loi De Snell-Descartes
Translate this page D'après cette loi importante, nommée en référence au mathématicien hollandaisWillebrord snell Van Royen, le produit de l'indice de réfraction par le
http://www.ambafrance-ma.org/archives/marocweb/projet08/optique3.htm
OPTIQUE Précédent Parent Acceuil Suivant III - Généralités : 1- Réflexion et réfraction : Si un rayon de lumière se propage dans un milieu homogène et arrive à la surface d'un second milieu homogène, une partie de la lumière est réfléchie et l'autre partie pénètre dans le second milieu (réfraction) et peut ou non y être absorbé. La proportion de la lumière réfléchie dépend du rapport des indices de réfraction des deux milieux considérés. Le plan d'incidence est défini par le rayon incident et la perpendiculaire, ou normale, à la surface au point d'incidence du rayon (voir figure 1). L'angle d'incidence est l'angle formé par le rayon incident et cette perpendiculaire. Les angles de réflexion et de réfraction sont les angles entre la normale et les rayons réfléchis et réfractés. D'après les lois de la réflexion, l'angle de réflexion est égal à l'angle d'incidence et le rayon incident, le rayon réfléchi et la normale au point d'incidence sont dans le même plan. Si la surface du second milieu est lisse, il peut agir comme un miroir et produire une image réfléchie (figure 2). La source lumineuse de la figure 2 est l'objet A. On considère qu'un point de A émet des rayons lumineux dans toutes les directions. Les deux rayons qui parviennent au miroir aux points C et D sont réfléchis. La réflexion produit respectivement les rayons (BD) et (CE). Pour un observateur situé devant le miroir, ces rayons semblent provenir d'un point unique F placé derrière le miroir. D'après les lois de la réflexion, les rayons (CF) et (AC) forment le même angle avec la surface du miroir. Il en est de même pour (AC) et (AB). Ainsi, dans le cas d'un miroir plan, l'image d'un objet semble être formée par les rayons issus d'une source située derrière le miroir à une distance de la surface du miroir égale à la distance entre la surface et l'image.

85. Encyclopædia Britannica
This law was discovered in 1621 by the Dutch astronomer and mathematicianWillebrord van Roijen snell (1580–1626; also called snellius).
http://www.britannica.com/eb/article?eu=70149

86. História Da Física
Translate this page ROENTGEN, Wilhelm Konrad. RUTHERFORD, Ernest. SCHRÖDINGER, Erwin. snell, Willebrordvan Roijen. STEVIN, Simon. TALES. TESLA, Nikola. THOMSON, Joseph John.
http://www.ahistoriadafisica.hpg.ig.com.br/grandesfisicos.htm
AMPÈRE, André Marie ARISTARCO ARISTÓTELES ARQUIMEDES ... YOUNG, Thomas BIBLIOGRAFIA
Ciência Ilustrada, Abril S.A.Cultural e Industrial.
Os Cientistas, Abril S.A.Cultural e Industrial.
Biografias, Gerson Ferracini, Editora Scipione.
Física, Beatriz Alvarenga e Antônio Máximo, Editora Scipione.
O Mundo da Eletricidade, Ottaviano de Fiore, Eletropaulo.

87. Óptica - Reseñas Históricas. - Snell - Ficha 3 - Laboratorio Virtual
Translate this page snell. Entre los papeles hallados a la muerte del matemático holandésWillebrord snellius en 1626 se encontró la deducción de esta ley.
http://enebro.pntic.mec.es/~fmag0006/op_rh_ficha3.html
SNELL que forman los rayos refractados. Y a partir de tales mediciones

88. Snell's Law
snell's Law. Sho Morimoto. In 1621, a Dutch physicist by the name of Willebrordsnell proposed his basic law of refraction that was later named after him.
http://www.fordhamprep.com/physics/snell.htm

89. 16¥@¬ö²üÄõ¼Æ¾Ç®a
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http://www.dyu.edu.tw/~mfht206/history/16/holland.htm
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90. Physics4all.co.il
The summary for this Hebrew page contains characters that cannot be correctly displayed in this language/character set.
http://www.physics4all.co.il/index.php?link=663

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