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Isaac Newton (1642–1727) used a prism to show that white light (22 Down) from the Sun can be split into the colours of the rainbow, and used a second prism to recombine the spectrum to obtain white light. He performed this experiment in 1664. Prisms existed before Newton’s experiments (they were used, for example, to produce attractive colours in chandeliers) but Newton’s love of finding things out set him apart from others.
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