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A diver viewed from below who appears inside of Snell's window. Snell's window (also called Snell's circle [1] or optical man-hole [2]) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. [3] This phenomenon is caused by refraction of light entering water, and is ...
English: Snell's window as seen through an underwater tunnel at the St. Louis Zoo. Caustics in the water are visible near the sun. The black line through the frame is a gasket between segments of the tunnel.
Through "Snell's window" (top), we see some of the scene above the water, including the handles of the ladder (right of center). The color-fringing of the light (top) and of the edge of Snell's window is due to variation of the refractive index, hence the critical angle, with wavelength. Reason I can't comment on its merits as a sports photo.
Willebrord Snellius [1] [2] (born Willebrord Snel van Royen) [3] (13 June 1580 [4] – 30 October 1626) was a Dutch astronomer and mathematician, commonly known as Snell. His name is usually associated with the law of refraction of light known as Snell's law. [5] The lunar crater Snellius is named after Willebrord Snellius.
Martin Edge (op cit, p223) observes "I was once under the impression that the deeper you went the more [of snell's window] could be included [in the photograph]. This is incorrect! To photograph the full circle you need a fisheye lens equivalent to a 12mm lens on a 35mm format."
The Geneva Window is a stained glass window consisting of 8 panels, created by Harry Clarke from 1927 to 1930. [ 1 ] [ 2 ] [ 3 ] It was originally commissioned by the Irish Free State government for the League of Nations' International Labour Building in Geneva. [ 3 ]
Earl Wilcox Snell (July 11, 1895 – October 28, 1947) was an American politician, businessman, and member of the Republican Party, serving in the Oregon House of Representatives, as the Oregon Secretary of State, and as the 23rd Governor of Oregon. American journalist John Gunther described Snell as "genial, mediocre, and perpetually on the ...
Sir John Snell (1629 – 6 August 1679), founder of the Snell Exhibitions at the University of Oxford, was born in Ayrshire, Scotland, the son of a blacksmith. [1] He attended the University of Glasgow from 1642 to 1644. [2] He joined the royalists during the English Civil War, and fought in several battles, including the Battle of Worcester.