What happens when two different colour light intersect?
Answers
Color is a visual perceptual property, created by the brain interpreting the output of the photoreceptors in the eyes. Those photoreceptors are stimulated by light. And light generally is a mixture of many different wavelengths at different intensities - a spectral power distribution. Having light of just a single wavelength (or a very narrow band) is kind of rare and is just a border case of a spectral power distribution. The colors that single wavelengths evoke are called spectral colors. If you look at a CIE chromaticity diagram, a flattened representation of all colors we can perceive, you'll see that spectral colors are only found on the upper boundary curve and therefore are a minority.
There's this thing called metamerism, which means that different spectral power distributions can be perceived as the same color. An easy example would be yellow: can be caused by an SPD that contains only spectral yellow (single wavelength) or by an SPD that contains a mixture of spectral red and green wavelengths. Furthermore, identical SPDs can appear to us as different colors, because of the elaborate processing our brains do. A famous example for that would be the checkershadow "illusion".
To recap: wavelength isn't color. Spectral power distribution (the proper generalization of "wavelength") isn't color either. Color is what the brain makes of it. Important quote from the checkershadow explanation:
As with many so-called illusions, this effect really demonstrates the success rather than the failure of the visual system. The visual system is not very good at being a physical light meter, but that is not its purpose. The important task is to break the image information down into meaningful components, and thereby perceive the nature of the objects in view.
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