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+// Example 2.6 
+// Computation of normalized frequency and no of guided modes
+// Page no 480
+clc;
+clear;
+close;
+
+//Given data
+lambda=1.30*10^-6;        // Wavelength of fiber
+a=25*10^-6;               // Core diameter of fiber
+delta=0.01;               // Relative refractive index 
+n1=1.50;                  // Refractive index of core
+
+// (a) Normalized frequency 
+v=((2*%pi*a*n1)/(lambda))*((2*delta)^(1/2)); 
+//(b) Number of guided modes
+m=v^2/2;                    
+//m=ceil(m);
+
+//Displaying results in the command window            
+printf("\n Normalized frequency = %0.2f  ",v);
+printf("\n Number of guided modes = %0.0f  ",m);
+
+//Answer varies due to round off error