About visible light spectrum

  1. I got this thing from wikipedia: [​IMG]
    [​IMG]
    Link to wikipedia: Visible spectrum

    So:
    - Is it the right scan of visible spectrum? Because when I search, there are a lots of other version, which is not really like each other. (Google Link)
    - What is the number of Wavelength of the TRUE red/orange/yellow/green/cyan/blue/violet? And the red/blue/green 's wavelength using in TV?

    Thanks a lots! And sorry for my bad English.
     
  2. jcsd
  3. The answer is yes... Moreover all images are same , just a very minor difference. Remember that in physics nothing is exact. Its just nearest approximation.

    Huh ? Number of wavelength ? That's wrong. Wavelength of colours are given in your image only. There are only 7 real colours : VIBGYOR .
    All others are sensations caused by combination of these real colours.

    No worries !
     
  4. Thanks for the good answer :)
    I have a mistake, my really means is the wavelength that show the truest color of V/O/B/G/Y/O/R. Also the wavelength of R/B/G color using in TV.
    Thanks again!
     
  5. Though it is typically considered that "red' boundary of visible spectrum is about 700-750 nm, a human eye can see a radiation with wavelength up to approx. 950 nm as red light, if the intensity is high enough. I observed 940-nm radiation of a laser diode which seem to me as dark-red. Concerning longer-wavelength radiation, an eye can see it in some cases due to non-linear processes at very high intensity level. I saw 1064-nm pulses which hit white- paper screen as green flashes at intensity of order of 10^9 W/cm^2. The green flashes were produced within my eye rather within the paper. It was established by use of green and IR light filters.
     
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