Foucault's measurement of the speed of light refers to a famous experiment carried out by the French physicist Léon Foucault in 1850. Foucault's apparatus involved a rotating mirror and a light source. In his experiment, light was directed toward a rotating mirror, reflected off it, and then sent to a stationary mirror placed some distance away. The rotating mirror would move slightly during the time it took for the light to travel to the stationary mirror and back.
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