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+// Example 5.26
+// Computation of (a) wavelength (b) power and (c) resposivity
+// page no 488
+
+clc;
+clear;
+close;
+
+//Given data
+e=0.7;                     // Quantum efficiency
+c=3*10^8;                  // Speed of light
+h=6.62*10^-34              // Planck constant
+E=1.5*10^-19;              // Energy of photons
+e1=1.6*10^-19;             // Electronic charge
+I=4*10^-6;                 // Diode photocurrent
+// (a) Wavelength of operation
+lambda=h*c/E;                    
+
+// (b) Responsivity
+R=e*(lambda*e1)/(h*c);                       //
+
+// (c) Incident optical power 
+p=I/R;                                //power
+
+//Display result on command window
+printf("\n Wavelength of operation (micrometer)= %0.3f  ",lambda*10^6);
+printf("\n Responsivity R (A/W) = %0.3f  ",R);
+printf("\n output power P (microwWatt) = %0.3f  ",p*10^6);