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Visible spectrum

From Simple English Wikipedia, the free encyclopedia
Electromagnetic Spectrum

Thevisible spectrum (or sometimes called theoptical spectrum) is the part of theelectromagnetic spectrum that isvisible to the humaneye.Electromagnetic radiation in this range ofwavelengths is calledvisible light or simplylight.

Laser beams with visible spectrum

A typical human eye will react to wavelengths inair from about 380 to 750 nm.[1]

The familiar colors of therainbow in thespectrum include all those colors that can be produced by visible light of a single wavelength only, thepure spectral ormonochromatic colors.

But there are no clear boundaries between one color and the next.[2]

Color display spectrum

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sRGB rendering of the spectrum of visible light
sRGB rendering of the spectrum of visible light
ColorWavelengthFrequencyPhoton energy
violet380–450 nm668–789 THz2.75–3.26 eV
blue450–495 nm606–668 THz2.50–2.75 eV
green495–570 nm526–606 THz2.17–2.50 eV
yellow570–590 nm508–526 THz2.10–2.17 eV
orange590–620 nm484–508 THz2.00–2.10 eV
red620–750 nm400–484 THz1.65–2.00 eV
Color displayspectrum. The narrow red, green and blue bars show the relative mixture of the three primary colors used to produce the color directly above.

Color displays (e.g.,computer monitors ortelevisions) mixred,green, andblue color to approximate the color spectrum. In the illustration, the narrow red, green and blue bars show the relative mixture of these three colors used to produce the color directly above.

References

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  1. 053446226XCecie Starr (2005).Biology: Concepts and Applications. Thomson Brooks/Cole.ISBN 9780534462239.
  2. Thomas J. Bruno, Paris D. N. Svoronos.CRC Handbook of Fundamental Spectroscopic Correlation Charts. CRC Press, 2005.


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