2 years ago
Last edited at 9:37PM on 10/8/2011
The color in a rainbow is actually in all light. The light is composed of many different wavelengths that are at a spectrum of amounts of energy. When a photon (the unit of light) hits your eyes at a visible wavelength it will activate particular receptor or receptors. A photon at a different energy will activate a different set. A rainbow is seen when natural light (containing all energy levels) is diffraction or separated based on their energy. You will always see the highest energy visible light [Blue] at the bottom (least separated from course) and the lowest energy light [Red] at the top (most separated). The spectrum between is directly related to the wavelength and amount of energy in it.