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how to measure speed of light rotating mirror. Next shine a light through one side of the wheel and aim it at a distant mirror. I append its redrawn scheme below light is reflected from the rotating mirror to the fixed one and from the later again to the rotating one which slightly rotates in the meantime so the light ends in the direction labeled air rather than back in the light source.
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Foucault employed a rapidly rotating mirror driven by a compressed air turbine to measure the speed of light. I append its redrawn scheme below light is reflected from the rotating mirror to the fixed one and from the later again to the rotating one which slightly rotates in the meantime so the light ends in the direction labeled air rather than back in the light source. When the rotation speed is low the light beam returns quickly enough so as to pass through the same opening through which it was transmitted.
Slowly turn the speed up until you shouldnt turn it up any further ask your lab instructor how much current you should allow this machine before you run it.
When the rotation speed is low the light beam returns quickly enough so as to pass through the same opening through which it was transmitted. The oscilloscope should get a spike each time the beam crosses the diode. Next shine a light through one side of the wheel and aim it at a distant mirror. 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.