Between the input (wavelength) and output (colour), what occurs? How do we receive 650nm, for example, and interpret it as red? What even is red? What is colour, really?
In: Physics
Color is just how your eyes react to a particular wavelength. For most people, the reaction to a particular wavelength is the same, so we all agree that wavelength correspond to a certain color (ex. red), just like if scientists measure a wavelength of 1cm, we all agree that this is a microwave. People who are colorblind has a different response in their eye so they can’t agree with the rest of us on that color.
Another analogy would be that for most people, getting pinched (input) is a “painful” sensation (response), getting tickled (input) is a “funny” sensation (response). For certain people who can’t feel pain, they have a hard time relating.
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