Visible last on color perception. Our eyes are sensitive only to a narrow band of frequencies within the enormous range of light frequencies of the electric magnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum. Visible light is that which is detectable by the human eye and consists of wavelengths ranging from approximately 390 nanometers, up to 780 nanometers. As we already know specific wavelengths within the spectrum correspond to a specific color based upon how a normal human eye perceives light of a wavelength. The longer wavelength and of the spectrum corresponds to light that is perceived by humans eyes to be read, and the shorter wavelength and the spread corresponds to the light that is perceived as violet.

You can check out the different graphics illustrated and approximate range of light frequencies and wavelengths that are associated with the various perceived colors within the spectrum.