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Armand Hippolyte Louis Fizeau
Armand Hippolyte Louis Fizeau 23 September 1819 – 18 September 1896) was a French physicist, who in 1849 measured the speed of light to within 5% accuracy. In 1851, he measured the speed of light in moving water in an experiment known as the Fizeau experiment. The Fizeau experiment was carried out by Hippolyte Fizeau in 1851 to measure the relative speeds of light in moving water. Fizeau used a special interferometer arrangement to measure the effect of movement of a medium upon the speed of light. Fizeau was involved in the discovery of the Doppler effect, which is known in French as the Doppler–Fizeau effect. In 1853, Fizeau described the use of a capacitor (sometimes termed a "condenser") as a means to increase the efficiency of the induction coil. Later, he studied the thermal expansion of solids and applied the phenomenon of interference of light to the measurement of the dilatations of crystals.
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