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Light - Wikipedia, the free encyclopedia


... uses, see Light (disambiguation) and Visible light (disambiguation) . A triangular prism dispersing a beam of white light. The longer wavelengths (red) and the shorter wavelengths (blue) get separated Light usually refers to visible light ...

Light-year - Wikipedia, the free encyclopedia


... astronomical units     6.3241 × 10 4   au     0.3066  pc Look up light year in Wiktion-ary, the free dictionary. A light-year (symbol: ly ), sometimes written light year or lightyear , is a unit of length used informally to express ...

Speed of light - Wikipedia, the free encyclopedia


Speed of light From Wikipedia, the free encyclopedia Jump to: navigation, search "Light-speed" redirects here. For other uses, see Speed of light (disambiguation) and Lightspeed (disambiguation). Speed of light Sunlight takes about 8 minutes ...

Faster-than-light - Wikipedia, the free encyclopedia


... subluminal velocity needs infinite energy to accelerate to the speed of light, although special relativity does not forbid the existence of particles that travel faster than light at all times ( tachyons ). On the other hand, what some ...

Incandescent light bulb - Wikipedia, the free encyclopedia


... the horizontal line between the vertical supply wires. An incandescent light bulb , inca-ndescent lamp or incandescent light globe is an electric light which produces light with a wire filament heated to a high temperature by an electric ...

Light-emitting diode - Wikipedia, the free encyclopedia


... retrofit LED lamp with aluminium heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage A light-emitting diode (LED) is a two-lead semiconductor light source. It is a pn-junction diode, ...

Light pollution - Wikipedia, the free encyclopedia


... Degradation of photic habitat by artificial light. [ 1 ] Alteration of natural light levels in the outdoor environment owing to artificial light sources. [ 2 ] Light pollution is the alteration of light levels in the outdoor environment ...

Light scattering - Wikipedia, the free encyclopedia


Light scattering - Wikipedia, the free encyclopedia Light scattering From Wikipedia, the free encyclopedia Jump to: navigation , search Light scattering is a form of scattering in which light is the form of propagating energy which is ...

Aberration of light - Wikipedia, the free encyclopedia


... the motion of an observed object during the time taken by its light to reach an observer, and relativistic beaming , which is an angling of the light emitted by a moving light source. It can be considered equivalent to them but in a ...

Light fixture - Wikipedia, the free encyclopedia


... Stage lighting instrument . A few types of light fixtures Ceiling light fixtures A light fixture (US English), light fitting (UK English), or luminaire is an electrical device used to create artificial light by use of an electric lamp . ...

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