Lens
Encyclopedia
Optics
- Lens (optics)Lens (optics)A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam. A simple lens consists of a single optical element...
, an optical element which converges or diverges light- Lens (anatomy)Lens (anatomy)The crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, thus allowing a...
, a part of the eye - Corrective lensCorrective lensA corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye...
for correction of human vision- Contact lensContact lensA contact lens, or simply contact, is a lens placed on the eye. They are considered medical devices and can be worn to correct vision, for cosmetic or therapeutic reasons. In 2004, it was estimated that 125 million people use contact lenses worldwide, including 28 to 38 million in the United...
, placed on the cornea of the eye
- Contact lens
- Photographic lensPhotographic lensA camera lens is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.While in principle a simple convex lens will suffice, in...
, a lens designed for use on a camera
- Lens (anatomy)
Focusing of other radiation and forces
- Gravitational lensGravitational lensA gravitational lens refers to a distribution of matter between a distant source and an observer, that is capable of bending the light from the source, as it travels towards the observer...
, a massive astronomical object which causes visual distortions - Electrostatic lensElectrostatic lensAn electrostatic lens is a device that assists in the transport of charged particles. For instance, it can guide electrons emitted from a sample to an electron analyzer, analogous to the way an optical lens assists in the transport of light in an optical instrument. The recent development of...
, a device used to focus or collimate electron beams - Explosive lensExplosive lensAn explosive lens—as used, for example, in nuclear weapons—is a highly specialized explosive charge, a special type of a shaped charge. In general, it is a device composed of several explosive charges that are shaped in such a way as to change the shape of the detonation wave passing through it,...
, a shaped explosive charge with focused blast - Microwave lens, used to focus microwave radiation in slotted waveguideSlotted waveguideA slotted waveguide is a waveguide that is used as an antenna in microwave radar applications. Prior to its use in surface search radar, such systems used a parabolic segment reflector....
antennas
Lentil-shaped things
- Lens (genus)Lens (genus)The genus Lens of the legume family Fabaceae contains four species of small, erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods...
, the genus of the lentil plant - Lens (geometry)Lens (geometry)In geometry, a lens is a biconvex shape comprising two circular arcs, joined at their endpoints. If the arcs have equal radii, it is called a symmetric lens.A concave-convex shape is called a lune...
, a geometric shape formed from two arcs - Lens (geology)Lens (geology)In geology a lens is a body of ore or rock or a deposit that is thick in the middle and thin at the edges, resembling a convex lens in cross-section. Adjective: "lenticular"....
, a body of ore or rock that is thick in the middle and thin at the edges - Lens (hydrology)Lens (hydrology)In hydrology a lens is a convex layer of fresh groundwater that floats on top of denser saltwater. It arises when rainwater seeps down through a soil surface and then gathers over a layer of seawater at or down to about five feet below sealevel...
, a layer of fresh water derived from rainfall, overlying saline groundwater - Kamera lensKamera lensKamera lens is a unicellular, flagellate organism and the only species of its genus Kamera. Though the species is known for centuries, it is poorly known. Its systematic position within the Eukaryota is unsure....
(biology), a unicellular, flagellate organism and the only species of the genus Kamera.
Places
- Arrondissement of LensArrondissement of LensThe arrondissement of Lens is an arrondissement of northern France, located in the Pas-de-Calais département, in the Nord-Pas de Calais région...
, in the département of Pas-de-Calais, France- Lens, Pas-de-CalaisLens, Pas-de-CalaisLens is a commune in the Pas-de-Calais department in northern France. It is one of France's large Picarde cities along with Lille, Valenciennes, Amiens, Roubaix, Tourcoing, Arras, and Douai.-Metropolitan area:...
, a commune in that arrondissement- RC LensRC LensRacing Club de Lens is a French association football club based in the northern city of Lens in the Pas-de-Calais department. Its nickname, sang et or , comes from its traditional colours of red and gold. Their primary rivals are their northern neighbors Lille OSC, whom they contest the Derby du...
, its football (soccer) club
- RC Lens
- Lens, Pas-de-Calais
- Lens, BelgiumLens, BelgiumLens is a Walloon municipality located in the Belgian province of Hainaut. In 2007 its population was 4042. The total area is 49.42 km² which gives a population density of 80 inhabitants per km²....
- Lens, ValaisLens, ValaisLens is a municipality in the district of Sierre in the canton of Valais in Switzerland.-Geography:Lens has an area, , of . Of this area, or 36.4% is used for agricultural purposes, while or 39.4% is forested...
, Switzerland
People
- Louis LensLouis LensLouis Lens, son of rose-breeder Victor Lens, born on 03/03/1924 and deceased on 10/05/2001, was the most esteemed rose breeder in the Benelux countries....
, Flemish rose breeder - Nicholas LensNicholas LensNicholas Lens is a contemporary Belgian author and composer.Lens was born in Ypres near the French border in Flanders, Belgium. His godfather taught him violin when he was five. He studied trumpet and double-bass, first at local academies and then at Royal conservatories. Later on he studied viola...
, Belgian composer - Josef LenseJosef LenseJosef Lense was an Austrian physicistIn 1914 Lense got his doctorate under Samuel Oppenheim. From 1927-28 he was Professor ordinarius and from 1928-1946 Professor extraordinarius for applied mathematics at the Technical University of Munich...
, physicist - Jeremain LensJeremain LensJeremain Lens is a Dutch-Surinam footballer who currently plays for PSV Eindhoven. He is a versatile offensive player, the best known for his pace and stamina, primarily being used as a winger or a striker, but he can successfully play as a second striker. In August 2010 he received the first...
, Dutch-Surinam footballer
Other uses
- Laser engineered net shapingLaser engineered net shapingLaser engineered net shaping or LENS is a technology developed by Sandia National Laboratories for fabricating metal parts directly from a computer-aided design solid model by using a metal powder injected into a molten pool created by a focused, high-powered laser beam.A high power laser is used...
, a rapid prototyping technology capable of building fully dense metal parts - Perspective (cognitive)Perspective (cognitive)Perspective in theory of cognition is the choice of a context or a reference from which to sense, categorize, measure or codify experience, cohesively forming a coherent belief, typically for comparing with another...
- Lens, a fictional alien device in E. E. Smith's Lensman series