“It has no justification in experiment exactly; it just represents something that he’s imposing upon the color spectrum by analogy with music.” Of his rainbow experiment Newton wrote that he had ...

When he shone sunlight through a prism, it split into the colors of the rainbow. Before Newton's discovery, people didn't realize that white light contained so many colors of the visible spectrum.

White light is made of a spectrum of different colours ... Light is refracted when it enters the prism, and each colour is refracted by a different amount. This means that the light leaving ...