Friday, May 21, 2010

If you mix red and violet, does it emit high or low frequency light waves?

Red light is low frequency and purple light is high frequency. What if you mixed red and purple paint to make red violet--would that emit high or low frequency waves? It can't be "in between" as that would be like... green. Does it emit both..?

If you mix red and violet, does it emit high or low frequency light waves?
It doesn't EMIT anything. It REFLECTS red-violet light.


The mixing of light is ADDITIVE


The mixing of pigments is SUBTRACTIVE
Reply:There is no such thing as a single wavelength (or frequency) of purple (red-violet) light. Purple is a mixture of long-wavelength (low-frequency) red light and short-wavelength (high-frequency) blue and violet light, with little or nothing in the medium-frequency yellows and greens.





Also, there is no such thing as a true red light. The longest wavelengths are actually more like scarlet, which tends slightly toward the yellow end. True red pigments, like light, is really a mixture of the extreme low and high frequencies of the visible spectrum, but only a bit of the high-frequency stuff. True red pigments or dyes reflect (or transmit) both long-wavelength and short-wavelength light. The "red" ink used in full-color printing isn't really red; it is magenta that absorbs only light in the middle of the visible spectrum and transmits or reflects the stuff at either end. When mixed with cyan (the "blue" ink that actually tends toward green and passes both green and blue light) the result is a dark blue, tending strongly toward violet. The cyan ink absorbs the lower-frequency reds and oranges and the magenta absorbs the middle-frequency greens, leaving you with only the high-frequency blues and violets.
Reply:High


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