In fiber fault location, the equation of length (l) for time difference (t) is expressed as L = ct / 2n1 . Which factor in this equation implies that the light travels a length from source to break point and then through another length on the return trip?

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In fiber fault location, the equation of length (l) for time difference (t) is expressed as L = ct / 2n<sub>1</sub> . Which factor in this equation implies that the light travels a length from source to break point and then through another length on the return trip?