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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Mean optical power launched into an 8 km fibre is 120 mu W and mean output power is 4 mu W, then the overall attenuation is

Mean optical power launched into an 8 km fibre is 120 mu W and mean output power is 4 mu W, then the overall attenuation is

Mean optical power launched into an 8 km fibre is 120 mu W and mean output power is 4 mu W then the overall attenuation is