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+// Example 4.23  
+// Calculation of overall external efficiency of a Laser diode
+// Page no 486
+
+clc;
+clear;
+close;
+
+//Given data
+eg=1.43;            // Bandgap energy
+v=2.5;              // Voltage applied
+nd=0.30;            // Optical efficiency of laser diode
+
+//// Overall external efficiency 
+ne=(nd*eg/v)*100;   
+
+//Display result in the command window
+printf("\n Overall external efficiency (percentage)= %0.0f .",ne);