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Light - Color and wavelengths | | Light - Color and wavelengths: Encyclopedia II - Light - Color and wavelengths | | The different wavelengths are detected by the human eye and then interpreted by the brain as colors, ranging from red at the longest wavelengths of about 700 nm. (lowest frequencies) to violet at the shortest wavelengths of about 400 nm. (highest frequencies). The intervening frequencies are seen as orange, yellow, green, cyan, blue, and, conventionally, indigo.
The wavelengths of the electromagnetic spectrum immediately outside the range that the human eye is able to perceive are called ultraviolet (UV) at ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave | | | Light, Light - 10th century optical theory, Light - A light wave, Light - Color and wavelengths, Light - Early Greek ideas, Light - Electromagnetic theory, Light - Light sources, Light - Measurement of light, Light - Optics, Light - Particle theory, Light - Particle theory revisited, Light - Quantum theory, Light - Refraction, Light - Speed of light, Light - The 'plenum', Light - Theories about light, Light - Visible electromagnetic radiation, Light - Wave theory, Light - Wave-particle duality, Color temperature, Huygens' principle, Fermat's principle, International Commission on Illumination, Light pollution, Lighting, Photic sneeze reflex, Photometry, Spectrometry | | |
| | | Light: Encyclopedia II - Light - Color and wavelengths
Light - Color and wavelengths
Main article: Color
The different wavelengths are detected by the human eye and then interpreted by the brain as colors, ranging from red at the longest wavelengths of about 700 nm. (lowest frequencies) to violet at the shortest wavelengths of about 400 nm. (highest frequencies). The intervening frequencies are seen as orange, yellow, green, cyan, blue, and, conventionally, indigo.
The wavelengths of the electromagnetic spectrum immediately outside the range that the human eye is able to perceive are called ultraviolet (UV) at the short wavelength (high frequency) end and infrared (IR) at the long wavelength (low frequency) end. Some animals, such as bees, can see UV radiation while others, such as pit viper snakes, can see infrared light.
UV radiation is not normally directly perceived by humans except in a very delayed fashion, as overexposure of the skin to UV light can cause sunburn, or skin cancer, and underexposure can cause vitamin D deficiency. However, because UV is a higher frequency radiation than visible light, it very easily can cause materials to fluoresce visible light.
Cameras that can detect IR and convert it to light are called, depending on their application, night-vision cameras or infrared cameras. These are different from image intensifier cameras, which only amplify available visible light.
When intense radiation (of any frequency) is absorbed in the skin, it causes heating which can be felt. Since hot objects are strong sources of infrared radiation, IR radiation is commonly associated with this sensation. Any intense radiation that can be absorbed in the skin will have the same effect, however.
Other related archives1637, 1660s, 1675, 1676, 1690, 16th century, 1704, 1746, 1817, 1845, 1847, 1849, 1850, 1862, 1873, 1877, 18th century, 1918, 1921, 1926, 1929, 19th century, 55 BC, A Treatise on Electricity and Magnetism, Académie des Sciences, Albert A. Michelson, Albert Einstein, Alhazen, Blue, California, Cameras, Cathodoluminescence, Cherenkov radiation, Christian Huygens, Color, Color temperature, Electromagnetic spectrum, Euler, Faraday, Faraday rotation, Fermat's principle, Francesco Grimaldi, Frequency, Fresnel, Galileo, Gamma ray, Green, Hertz, Hippolyte Fizeau, Huygens' principle, IR, Image processing, Infrared, Intensity, International Commission on Illumination, Io, Isaac Newton, James Clerk Maxwell, Jupiter, K, Light pollution, Lighting, Louis de Broglie, Lucretius, Léon Foucault, Max Planck, Maxwell's equations, Michelson-Morley experiment, Microwave, Nobel Committee, Ole Rømer, Optical spectrum, Opticks, Optics, Orange, Persian, Photic sneeze reflex, Photometry, Physics Prize, Pierre Gassendi, Planck's constant, Poisson, Polarization, Ptolemy, Radio waves, Red, Refraction, René Descartes, Robert Hooke, Spectrometry, Speed of light, Sun, THz, Terahertz radiation, Thomas Young, Ultraviolet, Violet, X-ray, Yellow, aether, amplitude, anatomy, antiparticle, atomists, bees, bioluminescence, black body, blue, brain, bremsstrahlung, brightness, cathode ray tube, chemoluminescence, chromosphere, color, colors, cone cells, contact lenses, cyan, cyclotron radiation, diffraction, diffraction experiment, dimensions, direction, electrical, electroluminescence, electromagnetic radiation, electromagnetic spectrum, electromagnetism, electron, electrons, emission lines, energy, eye, fireflies, flames, fluoresce, fluorescence, fluorescent lights, frequencies, frequency, gas, gas discharge, geometry, gravitational, green, hertz, image intensifier, incandescent light bulbs, indigo, infrared, infrared cameras, intensity, kilometres, laser, lenses, light-emitting diodes, luminiferous aether, magnetic, magnifying glasses, magnitude, maser, matter, medium, mercury-vapor lamps, metres, microscopes, miles, mirrors, momentum, moons, nanometres, neon lamps, neon signs, night-vision, optic nerve, optical phenomena, optics, orange, particle, particles, phosphorescence, photoelectric effect, photometry, photon, physics, pinhole camera, pit viper, polarization, polarized, proton, quanta, quantum theory, radio, radioactive decay, rainbows, red, reflection, refracting telescopes, refraction, refractive index, retina, rod cells, scalar, scintillation, scintillator, second, skin cancer, snakes, sodium, sonoluminescence, sound, spectacles, speed of light, spontaneous, square metre, steradian, stimulated, sunburn, sunlight, synchrotron radiation, telescope, televisions, temperature, time, triboluminescence, ultraviolet, vacuum, vector, velocity, violet, vision, vitamin D, watt, wave, wave-particle duality, wavelength, wavelengths, waves, yellow
 Adapted from the Wikipedia article "Color and wavelengths", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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