But, no one can specify the frequency of purple as there isn't one.
Red is 620- 750 nam, violet is 380 to 450 mm, but purple does not exist on any color frequency chart. Purple is a color our mind constructs when red and blue are present at the same time. But purple is not a specific, measurable color. Green, for instance, is 495-570 mm. No discrete mm for purple.
So while we see purple, it really does not exist as a spectral color with a measurable, specific frequency.
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