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Science
How is light speed measured?
2
The speed of light in a vacuum is 299,792,458 metres per second. A method of measuring the speed of light is to measure the time needed for light to travel to a mirror at a known distance and back using an oscilloscope.
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The currently most accurate method of measuring the speed of light is using laser and it is constant in vacuum at exactly 299,792,458 metres per second.
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