Comment This story repeats a stupid fallacy (Score 1) 330
White light splits into colors because of dispersion in the prism. Passing dispersed rays through another prism just disperses them more, it does not recombine them. This fallacy is famously repeated in public school science textbook diagrams of paired prisms. Newton never performed any such demonstration. He was able to demonstrate recombination in Opticks, but with something much more complicated than a pair of prisms.