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== Some more info... == |
== Some more info... == |
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This text below is what I used already in a presentation of mine ([http://www.e-builds.com/EM%20spectrum/ the electromagnetic spectrum]). I wanted to include more and happened to land here. Besides "taking", I'd figure I'd "give" something too. Don't know whether this |
This text below is what I used already in a presentation of mine ([http://www.e-builds.com/EM%20spectrum/ the electromagnetic spectrum]). I wanted to include more and happened to land here. Besides "taking", I'd figure I'd "give" something too. Don't know whether this is usefull[sic] or not for inclusion, but here it is: |
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Visible spectrum is only a very small band of the EM spectrum, though it is emitted and reflected by almost everything and it is also least absorbed by the atmopshere. Probably this is why evolution decided to make the four cells in the retina of the human eye sensitive to it. One type of cell 'feels' the intensity of light, the other 3 covers Redish, Greenish and Blue-ish intensities |
Visible spectrum is only a very small band of the EM spectrum, though it is emitted and reflected by almost everything and it is also least absorbed by the atmopshere[sic]. Probably this is why evolution decided to make the four cells in the retina of the human eye sensitive to it. One type of cell 'feels' the intensity of light,[sic] the other 3 covers[sic] Redish[sic], Greenish and Blue-ish[sic] intensities (each with it's[sic] sensitivity curves). Hence we can see all colours by a combination of those 3. |
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use: fibre optics, Astronomy |
use: fibre optics, Astronomy |
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use: RGB (red green blue) in TV |
use: RGB (red green blue) in TV/computers to "fool" our eyes to see all visible colors by adding different saturations of these colors |
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use: CYV (Cyan Yellow Violet?) in printers |
use: CYV[sic] (Cyan Yellow Violet?[sic]) in printers/copiers/painters to do the same thing but by substracting[sic] values |
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Can't recall for certain where I picked this up... Could have been in a Physics lecture. I'm given to understand that the various colors detected by the eye are not of fixed |
Can't recall for certain where I picked this up... Could have been in a Physics lecture. I'm given to understand that the various colors detected by the eye are not of fixed width—that is, the wavelengths perceived as green may be a wider band than those perceived as blue. Each person may have a slightly different "eye" for colors also. |
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See: [[Trichromat]], [[Tetrachromat]]. |
See: [[Trichromat]], [[Tetrachromat]]. |
Revision as of 05:23, 22 November 2004
optical spectrum from radio to x-rays? where did you get that from? please, references.
- I find it strange too, but it's lifted verbatim from the Federal Standard 1037C. I'm in doubt about removing the paragraph or not. At18 19:18, 16 Aug 2003 (UTC)
- At18 21:19, 16 Aug 2003 (UTC) Following be bold in updating pages policy, I removed this paragraph (radio? X-rays????):
- 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. At this writing, no formal spectral limits are recognized nationally or internationally.
Why isn't there a picture of the visible spectrum here? Malbi 13:35, 2 Dec 2003 (UTC)
Some more info...
This text below is what I used already in a presentation of mine (the electromagnetic spectrum). I wanted to include more and happened to land here. Besides "taking", I'd figure I'd "give" something too. Don't know whether this is usefull[sic] or not for inclusion, but here it is:
Visible spectrum is only a very small band of the EM spectrum, though it is emitted and reflected by almost everything and it is also least absorbed by the atmopshere[sic]. Probably this is why evolution decided to make the four cells in the retina of the human eye sensitive to it. One type of cell 'feels' the intensity of light,[sic] the other 3 covers[sic] Redish[sic], Greenish and Blue-ish[sic] intensities (each with it's[sic] sensitivity curves). Hence we can see all colours by a combination of those 3.
use: fibre optics, Astronomy use: RGB (red green blue) in TV/computers to "fool" our eyes to see all visible colors by adding different saturations of these colors use: CYV[sic] (Cyan Yellow Violet?[sic]) in printers/copiers/painters to do the same thing but by substracting[sic] values
Cheers, e-builds
Can't recall for certain where I picked this up... Could have been in a Physics lecture. I'm given to understand that the various colors detected by the eye are not of fixed width—that is, the wavelengths perceived as green may be a wider band than those perceived as blue. Each person may have a slightly different "eye" for colors also.
See: Trichromat, Tetrachromat.
karlheg 01:35, 2004 Oct 29 (UTC)