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+// Example 2.5 
+// Computation of (a) normalized frequency and (b) no. of guided modes
+// Page no 480
+
+clc;
+clear;
+close;
+
+//Given data
+lambda=0.85*10^-6;      // wavelength of fiber
+a=40*10^-6;             // core diameter of fiber
+delta=0.015;            // 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;       
+m=ceil(m);
+//Displaying results in the command window            
+printf("\n Normalized frequency is = %0.1f  ",v);
+printf("\n Number of guided modes = %0.0f  ",m);