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+//Example 7.12 // Optical gain and hFE
+clc;
+clear;
+close;
+//given data :
+h=6.63*10^-34;
+c=3*10^8;
+e=1.6*10^-19;
+Ic=15*10^-3;// in A
+P0=140*10^-6;// in W
+lamda=1.3*10^-6;// in m
+eta=45/100;// quantum efficiency
+G0=(h*c*Ic)/(e*P0*lamda);
+disp(G0,"The optical gain,G0 = ")
+h_FE=G0/eta;
+disp(h_FE,"hFE = ")
+// answer is wrong in the textbook