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Topic: Visible light

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In the News (Mon 22 Apr 19)

  Optical spectrum - Wikipedia, the free encyclopedia
The optical spectrum (light or visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye.
Wavelengths visible to the eye are defined by the spectral range of the "optical window", the region of the electromagnetic spectrum which passes largely unattenuated through the Earth's atmosphere (although blue light is scattered more than red light, which is the reason the sky is blue).
It is now known light is composed of photons (which display some of the properties of a wave and some of the properties of a particle), and that all light travels at the same speed (the speed of light) in a vacuum.
en.wikipedia.org /wiki/Visible_light   (646 words)

 Light - Wikipedia, the free encyclopedia
Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific setting, electromagnetic radiation of any wavelength.
Visible light is the portion of the electromagnetic spectrum between the frequencies of 380 THz (3.8×10
This is a light wave frozen in time and shows the two components of light; an electric field and a magnetic field that oscillate perpendicular to each other and to the direction of motion (a transverse wave).
en.wikipedia.org /wiki/Light   (2532 words)

 OLYMPUS MIC-D: Physics of Light and Color - Sources of Visible Light   (Site not responding. Last check: 2007-11-06)
The visible light that we are able to see (the spectrum is illustrated in Figure 1) is usually a mixture of wavelengths whose composition is a function of the light source.
Light emitting diodes are inherently monochromatic devices, with the color being determined by the separate band gap of the semiconductor utilized in the construction.
The generation of visible light in gas discharge lamps relies on the collision of atoms and ions in the gas with an electrical current that is passed between the electrodes placed at the ends of the bulbs.
www.mic-d.com /curriculum/lightandcolor/lightsources.html   (3715 words)

 [No title]   (Site not responding. Last check: 2007-11-06)
The optical spectrum (visible light or visible spectrum) is that portion of the electromagnetic spectrum which is visible to the human eye.
Wavelengths in the range visible to the eye occupy most of the "optical window", a range of wavelengths that are easily transmitted through the Earth's atmosphere.
Visible light is electromagnetic radiation that is made of colors of light that the eye can see.
www.informationgenius.com /encyclopedia/o/op/optical_spectrum.html   (202 words)

 Reading on Color & Light, Part I
Visible light is the range of wavelengths within the electromagnetic spectrum that the eye responds to.
The wavelengths of visible light are smaller than common objects such as the thickness of a sheet of paper or the diameter of a human hair.
The region of visible light in wavelengths shown as a linear arrangement (a) and as a circle (b) as conceived by Sir Isaac Newton.
acept.la.asu.edu /PiN/rdg/color/color.shtml   (1624 words)

 Visible light   (Site not responding. Last check: 2007-11-06)
The optical spectrum (visible light or visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye.
Wavelengths in the range visible to the eye occupy most of the " opticalwindow ", a range of wavelengths that are easily transmitted through the Earth's atmosphere.
Visible light is electromagneticradiation that is made of colors of light that the eye can see.
www.therfcc.org /visible-light-9862.html   (219 words)

 Learn more about Light in the online encyclopedia.   (Site not responding. Last check: 2007-11-06)
Light often means the portion of the electromagnetic spectrum visible to the human eye, but can also refer to other forms of electromagnetic radiation.
The three basic dimensions of light (and of all electromagnetic radiation) are brilliance (or amplitude), color (or frequency), and polarization (or angle of vibration).
Visible light is that portion of the spectrum between the wavelengths of about 400 nanometers (abbreviated nm) and 800 nm (in air).
www.onlineencyclopedia.org /l/li/light.html   (956 words)

 Visible Light Waves
When white light shines through a prism or through water vapor like this rainbow, the white light is broken apart into the colors of the visible light spectrum.
Light bulbs are another source of visible light waves.
This is a visible light image of Phoenix, Arizona, taken from the GOES satellite.
imagers.gsfc.nasa.gov /ems/visible.html   (691 words)

Visible light has wavelengths that range between 400 and 700 nanometers (one billionth of a meter).
Visible light penetrates into the ocean, but once past the sea surface, light is rapidly weakened by scattering and absorption.
The light energy of some colors is absorbed nearer to the sea surface than the light energy of other colors.
www.punaridge.org /doc/factoids/Light   (315 words)

 Visible Light and the Eye's Response
The long wavelength end of the spectrum corresponds to light which is perceived by humans to be red and the short wavelength end of the spectrum corresponds to light which is perceived to be violet.
When light of a given wavelength enters the eye and strikes the cones of the retina, a chemical reaction is activated which results in an electrical impulse being sent along nerves to the brain.
The rods respond to the incident light by sending a message forward to brain, saying "light is hitting me." Upon reaching the brain, the psychological occurs: the brain detects the electrical messages being sent by the cones and interprets the meaning of the messages.
www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2b.html   (1156 words)

 Photon Absorption: Visible and X-rays
In spite of the different material dependencies in the description of visible light and x-ray absorption, the mathematical description is the same for the two: the exponential decay law.
Light incident on a light absorbing material that is represented by a stack of equivalent thickness, t, layers.
The relations rely on the fact that the fraction of light which is absorbed is independent of the intensity of the incident light.
acept.la.asu.edu /PiN/rdg/visnxray/visnxray.shtml   (1715 words)

 UV-Visible Spectroscopy
In this respect the human eye is functioning as a spectrometer analyzing the light reflected from the surface of a solid or passing through a liquid.
Although we see sunlight (or white light) as uniform or homogeneous in color, it is actually composed of a broad range of radiation wavelengths in the ultraviolet (UV), visible and infrared (IR) portions of the spectrum.
Electromagnetic radiation such as visible light is commonly treated as a wave phenomenon, characterized by a wavelength or frequency.
www.cem.msu.edu /~reusch/VirtualText/Spectrpy/UV-Vis/spectrum.htm   (2030 words)

 Howstuffworks "How Light Works"
Light waves are a little more complicated, and they do not need a medium to travel through.
A light wave consists of energy in the form of electric and magnetic fields.
Light is one small part of the spectrum.
science.howstuffworks.com /light2.htm   (372 words)

 Optical spectrum : Visible light
The optical spectrum (visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye (see color for the sequence of colors).
The term "optical spectrum" originally applied only to that region of the electromagnetic spectrum which is visible to the normal human eye, but is now considered to include all wavelengths between the shortest wavelengths of X-rays and the longest of radio.
This light has wavelengths that are generally expressed in nanometers.
www.findword.org /vi/visible-light.html   (493 words)

 AllRefer.com - light (Physics) - Encyclopedia
The term "light" is often extended to adjacent wavelength ranges that the eye cannot detect : to infrared radiation, which has a frequency less than that of visible light, and to ultraviolet radiation and fl light, which have a frequency greater than that of visible light.
If white light, which contains all visible wavelengths, is separated, or dispersed, into a spectrum, each wavelength is seen to correspond to a different color.
Light that is all of the same wavelength and phase (all the waves are in step with one another) is called "coherent"; one of the most important modern applications of light has been the development of a source of coherent light : the laser.
reference.allrefer.com /encyclopedia/L/light.html   (246 words)

 The Electromagnetic and Visible Spectra
The focus of Lesson 2 will be upon the visible light region - the very narrow band of wavelengths located to the right of the infrared region and to the left of the ultraviolet region.
In this sense, we are referring to visible light, a small spectrum of the enormous range of frequencies of electromagnetic radiation.
When all the wavelengths of the visible light spectrum strike your eye at the same time, white is perceived.
www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2a.html   (670 words)

 The Electromagnetic Spectrum: Visible light   (Site not responding. Last check: 2007-11-06)
White light is actually made up of a whole range of colours, mixed together.
We can see this if we pass white light through a glass prism - the violet light is bent ("refracted") more than the red, because it has a shorter wavelength - and we see a rainbow of colours.
, where the light is reflected from the tiny pits in the disc, and the pattern is detected and translated into sound or data.
www.darvill.clara.net /emag/emagvis.htm   (226 words)

 Visible Light and Lasers
Some of this light triggers other atoms to release their energy, thus more light is added to the triggering light.
In order to increase light emission there must be more atoms in the excited state than the ground state; this is called population inversion.
When a source of light waves is moving with respect to an observer, it changes the frequency that is observed.
www.smgaels.org /physics/lights.htm   (713 words)

 Universe Today - Where Does Visible Light Come From?
Ultraviolet light is converted to heat by glass in the same way furnishings absorb and re-radiate visible light.
In the photosphere ("the sphere of visible light") atoms are "heated" by convection and stimulated through refraction to vibrate at a rate slow enough to give off visible light.
And it is this principle that accounts for the visible light emitted by stars which are - by far - the most significant source of light seen throughout the cosmos.
www.universetoday.com /am/publish/where_does_visible_light.html   (2022 words)

 Electromagnetic Spectrum
The narrow visible part of the electromagnetic spectrum corresponds to the wavelengths near the maximum of the Sun's radiation curve.
White light may be separated into its spectral colors by dispersion in a prism.
In interactions with matter, gamma rays are ionizing radiation and produce physiological effects which are not observed with any exposure of non-ionizing radiation, such as the risk of mutations or cancer in tissue.
hyperphysics.phy-astr.gsu.edu /hbase/ems3.html   (537 words)

 [No title]
Visible light communications are an attractive option for the instantaneous transmission of huge quantities of data.
Because the light that is being used is visible to the human eye, it is obvious at a glance which pieces of equipment are communicating.
Visible light communications is beginning to receive attention as a new communications medium for intelligent transport systems.
www.telephonyworld.com /cgi-bin/review/viewnews.cgi?category=all&id=1097005345   (1272 words)

 Making Waves   (Site not responding. Last check: 2007-11-06)
There is nothing special about visible light, except it stimulates the little antennae on your retina called "rods" and "cones".
Visible light is a higher frequency than radio waves.
Visible light is not used because it is not convenient.
www.newton.dep.anl.gov /askasci/phy00/phy00317.htm   (362 words)

 E.A.R. Inc. Online Store
The light filtration characteristics of this lens accentuates bright targets against a medium to dark background environment, such as trees.
This lens is used to enhance your environment on bright sunny days, and reacts along the same principles as the light vermillion shade by sharpening the contrast of the target against green backgrounds.
Light Purple - This lighter colored lens combining the gray and vermillion shades to dampen the green backgrounds and enhance clarity of the target against tall trees.
www.earinc.com /shop/product_info.php?products_id=40   (972 words)

 Light Pollution Authority Home Page - www.darksky.org
Light pollution is not a matter of life and death.
Reducing light pollution is not difficult, but it does require that public officials and ordinary citizens be aware of the problem and act to counter it.
This depends on the ability and experience of the observer, the state of dark adaptation of the observer, the sky brightness due to light pollution from electric lights and natural sources such as the Moon, and the clarity of the sky.
www.darksky.org   (1536 words)

 Visible Light - Succeed in Physical Science
Visible light is part of the electromagnetic spectrum of waves.
Visible light is created when an object becomes sufficiently hot, as well as from some chemical and electrical reactions.
Visible light is the part of the electromagnetic spectrum of waves that you can detect or see.
www.school-for-champions.com /science/light.htm   (809 words)

 Electromagnetic Spectrum   (Site not responding. Last check: 2007-11-06)
Visible light is made up of electromagnetic waves, vibrations of electric and magnetic fields that propagate through space.
The wavelength of such light is but 700 nanometers long,which means that one wave spans only 7/10 000 000, or 7 ten millionths of a meter.
Measuring a single wavelength of this light against the length of a meter is like comparing a thumbtack's diameter to the distance across the United States.
archive.ncsa.uiuc.edu /Cyberia/Bima/spectrum.html   (410 words)

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