First of all, I don’t understand why indigo and violet are split… why not just call it purple? Ok, not my question.
Colors of the rainbow all make sense to me except purple.
Red – orange – yellow…makes sense that orange is between red and yellow, and it’s the combination of those two primary colors, nice transition
This follows with green, blue. Green is between yellow and blue.
Now… if purple aka indigo and violet are a combination of blue and red, how can it be on the opposite end of red (very different frequency) and outside the frequency range of blue? I would expect a secondary color’s frequency to be between the two primary colors that create it
In: 76
Red has wavelength of 800 nm. Blue has wavelength of 400 nm. It happens that 400 nm light looks slightly red because it also activates the red pigment detectors, for whatever reason.
You can check human color cone response as function of wavelength here. [https://midimagic.sgc-hosting.com/huvision.htm](https://midimagic.sgc-hosting.com/huvision.htm) where you should notice that red cells have small hump at the extreme end of blue, so these colors being to look red again.
From a physical point of view, this is aberration and imperfection of our visual system. The spectrum should end with blue just fading out.
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