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+//Example 3.2 // The loss
+clc;
+clear;
+close;
+//given data :
+format('v',5)
+n1=1.5;
+n2=1;
+r=((n1-n2)/(n1+n2))^2;
+L_f= (-10*log10(1-r));
+disp(L_f,"The optical loss at one end,(dB) = ")
+Lt=2*L_f;
+disp(Lt,"Total loss at both joints,(dB) = ")