How does the eye determine the various colors of visible light?
Our perception of colors comes from a combination of the sensing of light in the eye and the processing of that information in the brain. The first step is that we have three types of cone receptors in the eye that respond to different wavelengths of light. Approximately, they respond to red, green, and blue light respectively. It is the responses of these three receptor types, in various proportions, to the light present in a scene that initiates the process of color vision.
