Notice that the spectrum of colors from one of the tubes is closely spaced with small gaps between different colors, while another tube has only a few colors which are widely separated in space. Provide an argument to support your answer. This is a result of a phenomenon known as additive color mixing and is the next topics to be consider. We have seen that a prism or diffraction grating can spread light out into its constituent colors. Either of these devices will spread sunlight into all the colors of the visible spectrum extending from red to violet.
Sunlight includes all the colors that the human eye detects.
Light containing all visible colors is called white light, therefore, sunlight is white light. When sun light illuminates an object, the object appears white if all visible colors are reflected equally. If all colors are not reflected equally, then the object appears colored. In general, light appears colored when one or more constituents of the visible spectrum are missing. Color perception depends on the physiology of our eye and brain.