The spectrum is an array of pure colors ie. Colors that are associated with a single wavelength of light. read more
The spectrum is an array of pure colors ie. Colors that are associated with a single wavelength of light. We can perceive many other colors that are a mixture of wavelengths and these are not part of the spectrum, white being one of these mixed wavelength colors. Therefore, white is not part of the spectrum. read more
Light at the lower end of the visible spectrum, having a longer wavelength, about 740 nm, is seen as red; light in the middle of the spectrum is seen as green; and light at the upper end of the spectrum, with a wavelength of about 380 nm, is seen as violet. read more