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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.
Ngô Đình Cẩn (Vietnamese: [ŋo˧ ɗɨ̞̠n˦˩ kəŋ˦˩]; 1911 – 9 May 1964) was the younger brother and confidant of South Vietnam's first president, Ngô Đình Diệm, and an important member of the Diệm government.
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.
Liang published Phan's 1905 work Việt Nam vong quốc sử (History of the Loss of Vietnam) and intended to distribute it in China and abroad, but also to smuggle it into Vietnam. Phan wanted to rally people to support the cause for Vietnamese independence; the work is regarded as one of the most important books in the history of Vietnam's ...
Vũ Ngọc Nhạ was amongst many North Vietnamese intelligence agents sent to South Vietnam for intelligence activities after the 1954 Geneva Accords, under the cover of a devout Catholic adherent who were upset with Viet Minh's "discrimination" against his family and religion and them "defected" to participate in Self-Defence Militia of Phát ...
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 Lê dynasty, also known in historiography as the Later Lê dynasty (Vietnamese: "Nhà Hậu Lê" or "Triều Hậu Lê", chữ Hán: 朝後黎, chữ Nôm: 茹後黎 [b]), officially Đại Việt (Vietnamese: Đại Việt; Chữ Hán: 大越), was the longest-ruling Vietnamese dynasty, having ruled from 1428 to 1789, with an interregnum between 1527 and 1533.