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+//Example 8.4: The multiplication
+clc;
+clear;
+close;
+format('v',5)
+//given data :
+eta=40/100;//
+e=1.6*10^-19;// in J
+h=6.626*10^-34;//in Js
+c=3*10^8;// in m s^-1
+lamda=1.3*10^-6;// in m
+P_in=0.3*10^-6;// in W
+I=6*10^-6;// in A
+M=(I*h*c)/(P_in*eta*e*lamda);
+disp(M,"The multiplication factor,M = ")