How does the spinning mirror experiment measure light speed?

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Offline chris

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I watched a scientist demonstrate measuring the speed of light using a spinning mirror. How does this work?
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Offline evan_au

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See the Fizeau–Foucault apparatus, which was used to measure the speed of light in 1850.
 

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Offline chris

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Gosh, I hadn't realised that they did that so long ago. Foucault was a bright guy!
I never forget a face, but in your case I'll make an exception - Groucho Marx