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What is quicker than the eye? (Posted on 2004-03-04) Difficulty: 5 of 5
As you probably know... a given color of light can generally, be described by one number (e.g., the frequency of its wave length).

The color white, however, has no associated frequency; it is composed of equal amounts of all the (visible) frequencies of light. Black, of course, is the absence of light. And various shades of grey are generally composed of various intensities of white (as you lower the overall intensity of white, the grey gets darker and approaches black).

The question is: why is light (optically) additive? More specifically, why is it that when we add Red and Green together we get Yellow; Green and Blue together, we get Cyan; Red, Green, and Blue together, we get white?

(Please don't confuse this with the subtractive quality of pigments/paints, where as we add more colors, particularly more of the primary colors red, yellow, and blue, we approach black.)

Could we use three (or more) different colors and achieve the same result?

No Solution Yet Submitted by SilverKnight    
Rating: 3.7000 (10 votes)

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Just a thought | Comment 11 of 14 |

How we perceive light is merely a result of the physical contruction of our eyes, and the signals interpreted by our brains.

As for the using other colors, I would say it is not possible unless we use a device to change the frequencies to our visible spectrum.  For example,  Night Vision Goggles intensifies light and changes it to a green illumination that we can see.


  Posted by Bruce Brantley on 2004-09-01 22:32:58
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