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
Out eyes have four types of light-sensing cell, the fourth of which is not important for this question. The other three detect a range of frequencies, which normally correspond to a set range of frequencies which we lump together as ‘red, green, and blue’. A red object’s light is mainly absorbed by the ‘red’ cells, and so on.
Our brain interprets the signals from these cells to produce color. Therefore, color is an experience like taste, while frequency range is an objective and measurable fact.
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