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+// Example 6.39
+// Calculation of a) operating wavelength b) incidence optical power
+// Page no 495
+
+clc;
+clear;
+close;
+
+//Given data
+n=0.60                            // Quantum efficiency
+E=1.5*10^-19;                    // Photons of energy
+e=1.602*10^-19;                  // Charge of an electron
+h=6.626*10^-34;                  // Planck constant 
+c=3*10^8;                        // Velocity of light
+I=2*10^-6;                      // Photocurrent
+
+
+// a)Operating wavelength
+lambda=(h*c)/E;
+lambda=lambda*10^6;
+
+// b)Incident optical power
+R=(n*e)/E;
+P=I/R;
+P=P*10^6;
+
+
+//Displaying results in the command window            
+printf("\n Wavelength of photodiode (in micrometer)= %0.2f  ",lambda);
+printf("\n Incident optical power(in microWatt) = %0.2f  ",P);
+
+// The answers vary due to round off error