If orange has a frequency in the visible spectrum that is 620nm, how does light that is 2/3 red at 750nm and 1/3 green at 570nm also make orange?
In: Physics
See [this diagram](https://en.wikipedia.org/wiki/File:CIE-1931_diagram_in_LAB_space.svg) which allows you to work out how colours mix additively. Draw a line from 750nm to 570nm and you’ll see the point dividing the line in a 2:1 ratio is in the reddish orange region.
Note that 750nm is right at the limit of human vision so we see it only very dimly. If you meant 2/3 red measuring in watts then it will appear much dimmer than 1/3 green. If you measure in lumens, which means weighted to account for human perception, the result would be different.
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