the velocity of light in a vacuum
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Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water..!!
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The distance that the light is known to travel in 1 second in vacuum is 299,792,458 meters to be precise. The speed of light in vacuum is famously known constant with a value given by: c=3×108m/s.
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