Quotation from: General Science

Written by: Bertha M. Clark


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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