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+// Example 7.10.3  page 7.54
+
+clc;
+clear;
+
+lamda=900d-9;
+h=6.626d-34;    //plank's constant
+c=3d8;      //speed of light
+q=1.6d-19;  //charge of electron
+eta=65/100; //quantum efficiency
+P0=0.5d-6;  //incident optical power
+Im=10d2;   //avalanche gain
+
+R= eta*q*lamda/(h*c);   //computong responsivity
+Ip=10^8*P0*R;       //computing photocurrent
+Ip=floor(Ip);
+M=Im/Ip;        //computing multiplication factor
+printf("\nMultiplication factor is %d.",M);
+