While light has so many wavelengths why only 3 colours exist as primary colours? Why do some colours disperse while VIBGYOR colours don't (except the primary ones which satisfy the logic as they are basic colours)
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2$\begingroup$ This has already been asked: physics.stackexchange.com/q/24263 $\endgroup$– QuirkyTurtle98Commented May 21, 2017 at 16:42
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5$\begingroup$ Possible duplicate of Is it only red, green and blue that can make up any color through additive mixture? $\endgroup$– sammy gerbilCommented May 21, 2017 at 16:45
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$\begingroup$ Related : What, if anything, makes primary colours distinct? $\endgroup$– sammy gerbilCommented May 21, 2017 at 16:47
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$\begingroup$ Possible duplicate of What are colors? $\endgroup$– Kunal PawarCommented May 21, 2017 at 16:52
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$\begingroup$ What exactly makes mixed colour green light (blue crayon on yellow sheet of paper) and monochromatic light different (I believe that mixed light must be resultant of constructive wave interference of blue light and yellow light) $\endgroup$– user37060Commented May 21, 2017 at 16:59
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1 Answer
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Red, green and blue are called primary colors because when mixed they give us an impression of what we call white light, where "white" means the impression produced in our brain by a range of frequencies as emitted by a black body at a certain temperature, about 6000K, the temperature of the sun surface. In the classic experiment, a spinning disc has three sectors painted RGB but the color appears white. We use the same concept for "white" noise - a continuous range of frequencies, not single frequencies.
