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+// Example 2.8
+// Calculation of normalized frequency and no of guided modes
+// Page no 481
+clc;
+clear;
+close;
+
+//Given data
+lambda=1.55*10^-6;         // Wavelength of fiber
+a=4*10^-6;                 // Core diameter of fiber
+delta=0.01;                // Relative refractive index 
+n1=1.48;                   // Refractive index of core
+// (a) Normalized frequency 
+v=(2*%pi*a*n1*(2*delta)^(1/2))/lambda; 
+//(b) Number of guided modes
+m=v^2/2;                               
+
+//Displaying results in the command window            
+printf("\n Normalized frequency = %0.3f  ",v);
+printf("\n Number of guided modes = %0.0f  ",m);
+// The answers vary due to round off error