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+clc;
+clear;
+L=0.5 //length of the fibre in km
+I_0=7.5*10^-6 //input power in Watt
+I_t=8.6*10^-6 //output power in Watt
+
+//calculation
+alpha=-(10/0.5)*log10(I_0/I_t)
+
+mprintf("The loss specification of the fibre is = %1.1f dB/km",alpha)
+//The answer varies dur to round off error.