Quotation from: General ScienceWritten by: Bertha M. Clark |
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If a prism _B_ (Fig. 87) exactly similar to _A_ in every way is placed behind _A_ in a reversed position, it will undo the dispersion of _A_, bending upward the seven different beams in such a way that they emerge together and produce a white spot on the screen. Thus we see, from two simple experiments, that all the colors of the rainbow may be obtained from white light, and that these colors may be in turn recombined to produce white light.
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