Related topics from BritannicaLens
industrial town, Pas-de-Calais departement, Nord-Pas-de-Calais region, northern France, southwest of Lille. It was the chief urban centre of the Pas-de-Calais coal basin. Since the demise of coal ...
lens
in anatomy, a nearly transparent biconvex structure suspended behind the iris of the eye, the sole function of which is to focus light rays onto the retina. The lens is made up of unusual elongated ...
lens
in optics, piece of glass or other transparent substance that is used to form an image of an object by focusing rays of light from the object. A lens is a piece of transparent material, usually ...
contact lens
thin, artificial lens worn on the surface of the eye to correct refractive defects of vision. The first contact lens, made of glass, was developed by Adolf Fick in 1887 to correct irregular ...
Fresnel lens
succession of concentric rings, each consisting of an element of a simple lens, assembled in proper relationship on a flat surface to provide a short focal length (see ). The Fresnel lens is used ...
lens dislocation
abnormal position of the crystalline lens of the eye. The dislocation, which may be congenital, developmental, or acquired (typically via trauma), is usually caused by abnormalities of or injury to a ...
Deighton, Len
English author, journalist, film producer, and a leading writer of spy stories, his best-known being his first, The Ipcress File (1962), an account of deception and betrayal in an espionage agency.Fitzgerald, Len
Australian rules football player was one of Australia's finest "footy" players in the era before the separate state leagues evolved into the national Australian Football League (AFL). Fitzgerald ...
Evans, Len
British-born Australian wine writer (b. Aug. 1, 1930, Felixstowe, Suffolk, Eng.-d. Aug. 17, 2006, Newcastle, N.S.W., Australia), as an enthusiastic and tireless advocate of Australian wine, was in ...
Murray, Len
British trade unionist (b. Aug. 2, 1922, Hadley, Shropshire, Eng.-d. May 20, 2004, London, Eng.), was the enormously powerful assistant general secretary (1969-73) and general secretary (1973-84) of ...
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