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how to measure speed of light rotating mirror. The project implied the working out of a terrestrial method of measuring the speed of light and Arago suggested that this could be done by using a rotating mirror2 In 1849 Fizeau calculated a value for the speed of light more precise than the previous value determined by Ole Romer in 1676. With a very straightforward calculation the speed of light can be calculated.
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Speed of light c 8 p nd2aII d b Foucault used a mirror with a radius of curvature of 20 m and with a rate of rotation of 800 revolutions per second. However Leon Foucault used an improved apparatus that comprised rotating mirrors and dragged down the value to 298000 kms. The light reflects off this mirror and back to the opposite side of the wheel where you can look at the reflection.
Since both the speed of rotation and the distance to the mirror were well established it was possible to measure the difference between the angle of the light as it entered the apparatus and when it exited the setup and calculate the speed of light from that.
The displacement between the first and second observations is proportional to the transit time of the light to the angular velocity of the rotating mirror. II was 07 mm. Speed of light c 8 p nd2aII d b Foucault used a mirror with a radius of curvature of 20 m and with a rate of rotation of 800 revolutions per second. In the famous relativity equation E mc2 the speed of light c serves as a constant of proportionality linking the formerly disparate concepts of mass m and energy E.
