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+// Example 4.21  
+// Calculation of wavelength seperation between longitudinal modes.
+// Page no 486
+
+clc;
+clear;
+close;
+
+//Given data
+lambda=0.85;                   // Wavelength
+n1=3.6;                        // Refractive index of GaAs
+L=200*10^-6;                   // Length of cavity
+
+// Wavelength seperation between longitudinal modes.
+lambda1=((lambda)^2)*(10^-12)/(2*n1*L);   
+lambda1=lambda1*10^9;
+
+//Displaying results in the command window
+printf("\n Wavelength seperation (in nm^2) = %0.1f ",lambda1);