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In the spectrum of white light, why yellow is considered as the mean colour?
In the spectrum of white light,there are seven visible colour. So the average or mean of these seven colours should the 4th colour which is green. Then, why yellow is considered as the mean colour?
You really could consider yellow or green to be the mean color.
On a frequency basis, visible light ranges from 400 Terahertz to 790 Terahertz (may be slightly off).
On a vacuum wavelength basis, it ranges from 380 nanometers to 750 nanometers.
The corresponding digits of these numbers are complete coincidence. Also, 790 THz is violet and 380 nm is violet. Thus the 700 numbers do not mean the same color.
The average frequency is 595 Terahertz (504 nm), which is green
The average vacuum wavelength is 565 nanomenters (540 THz), which is yellow
Either of these colors, though different, can be defined as the mean color
Another concept to consider is that the seven colors of the rainbow have no specific spectral width per color, neither do they have any concretely defined limits of each color. Red has an extremely wide spectral width compared to the other colors in the rainbow. It is the human eye that creates 7 distinct colors out of the rainbow.
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