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émission visible

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  • Emission theory (vision) — Emission theory or extramission theory is the proposal that visual perception is accomplished by rays of light emitted by the eyes. This theory has been replaced by intromission theory, which is that visual perception is accomplished by rays of… …   Wikipedia

  • Emission spectrum — The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted by the element s atoms or the compound s molecules when they are returned to a lower energy state. Each element s …   Wikipedia

  • Visible spectrum — White light is dispersed by a prism into the colors of the optical spectrum. The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye …   Wikipedia

  • Visible — Lumière visible Le spectre électromagnétique (le spectre visible correspond aux couleurs en bas du schéma) La lumière visible, appelée aussi spectre visible ou spectre optique est la partie du spectre électromagnétique qui est visible pour l œil… …   Wikipédia en Français

  • Emission nebula — An emission nebula is a cloud of ionized gas ( i.e. a plasma) emitting light of various colors. The most common source for ionization are high energy photons emitted from a nearby hot star. Among the several different types of emission nebula are …   Wikipedia

  • Emission Nebula —    A nebula that derives its visible light from the fluorescence of ultraviolet light which comes from a star that is in or near the nebula …   The writer's dictionary of science fiction, fantasy, horror and mythology

  • Light Amplification by Stimulated Emission of Radiation — Laser Pour les articles homonymes, voir Laser (homonymie). Rayon laser à travers un dispositif optique …   Wikipédia en Français

  • Thermal Emission Imaging System — The Thermal Emission Imaging System (THEMIS) is a camera on board the 2001 Mars Odyssey orbiter. It images Mars in the visible and infrared parts of the electromagnetic spectrum in order to determine the thermal properties of the surface and to… …   Wikipedia

  • Field emission display — A field emission display (FED) is a display technology that incorporates flat panel display technology that uses large area field electron emission sources to provide electrons that strike colored phosphor to produce a color image as a electronic …   Wikipedia

  • Atomic emission spectroscopy — (AES) is a method of chemical analysis that uses the intensity of light emitted from a flame, plasma, arc, or spark at a particular wavelength to determine the quantity of an element in a sample. The wavelength of the atomic spectral line gives… …   Wikipedia

  • Ultraviolet–visible spectroscopy — Beckman DU640 UV/Vis spectrophotometer. Ultraviolet visible spectroscopy or ultraviolet visible spectrophotometry (UV Vis or UV/Vis) refers to absorption spectroscopy or reflectance spectroscopy in the ultraviolet visible spectral region. This… …   Wikipedia

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