![]() Young’s Double Slit Experiment: Light is sent through two vertical slits and is diffracted into a pattern of vertical lines spread out horizontally. ![]() The pattern that resulted can be seen in. In his experiment, he sent light through two closely spaced vertical slits and observed the resulting pattern on the wall behind them. People did not accept the theory that light was a wave until 1801, when English physicist Thomas Young performed his double-slit experiment. Newton felt that color, interference, and diffraction effects needed a better explanation. But some people disagreed with him, most notably Isaac Newton. As we discussed in the atom about the Huygens principle, Christiaan Huygens proved in 1628 that light was a wave. The double-slit experiment, also called Young’s experiment, shows that matter and energy can display both wave and particle characteristics.
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