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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.
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.
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.
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."
Gordon Snell is a British author of children's literature [3] and scriptwriter. [4] He was married to Irish author Maeve Binchy from 1977 until her death in 2012. [ 5 ] He lives in the home that he shared with his late wife in Dalkey , outside of Dublin , Ireland .
Adrian Snell (born 1954) is an English pianist, keyboard player, singer and composer. Biography. ... Children of Exile (with Jenny Robertson) - (1990)
Hannah Snell (23 April 1723 – 8 February 1792) was an English woman who disguised herself as a man to join the British military. Snell was mentioned in James Woodforde's diary entry of 21 May 1778 selling buttons, garters, and laces. [1]