distance travelled by light in any medium?
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Distance measurement
Because light travels about 300000 kilometres (186000 mi) in one second, these measurements of small fractions of a second must be very precise.
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Light traveling in a uniform substance, or medium, propagates in a straight line at a relatively constant speed, unless it is refracted, reflected, diffracted, or perturbed in some other manner. ... A light-year equals 9.5 trillion kilometers or about 5.9 trillion miles.
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