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+
+// Example 7.5.5  page 7.25
+
+clc;
+clear;
+
+h=6.626d-34;    //plank's constant
+c=3d8;      //speed of light
+eta=70/100; //quantum efficiency
+I=3d-6;     //photocurrent 
+E=1.8d-19;  //energy of photns
+q=1.6d-19;  //charge of electron
+
+lamda=h*c/E;   //computing wavelength
+R=eta*q*lamda/(h*c);    //computing responsivity
+Popt=I/R;       //computing optical power
+lamda=lamda*10^6;
+Popt=Popt*10^6;
+
+printf("\nWavelength is %.2f micrometer.\nResponsivity is %.3f A/W.\nIncident optical power required is %.3f microWatt.",lamda,R,Popt);
+
+//answer of Popt in the book is calculated as 4.823, deviation of 0.002