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—Thomas Young's Double Slit Experiment

—In 1801, an English physicist named Thomas Young performed an experiment that strongly inferred the wave-like nature of light. Because he believed that light was composed of waves, Young reasoned that some type of interaction would occur when two light waves met. This interactive tutorial explores how coherent light waves interact when passed through two closely spaced slits.

—http://micro.magnet.fsu.edu/primer/java/interference/doubleslit/index.html