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+// Example 3.20 
+// Computation of pulse power
+// Page no 485
+
+clc;
+clear;
+close;
+
+// Given data
+L=0.1;               // Length of laser
+R=0.8;               // Mirror reflectance of end mirror
+E=1.7;               // Laser pulse energy
+c=3*10^8;            // Velocity of light
+t=L/((1-R)*c);         // Cavity life time
+
+// Pulse power
+p=E/t;                       
+
+//Display result on command window
+printf("\n Pulse power (W)= %0.0f  ",p);
+