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+// Example 2.7.16  page 2.35
+
+clc;
+clear;
+
+NA=0.25;     //Numericla aperture
+d=45d-6;        //Diameter of core
+lamda=1.5d-6;      //Wavelength
+
+a=d/2;      //computing radius
+v=2*3.14*a*NA/lamda;    //computing normalized frequency
+Mg=v^2/4;       //computing mode volume for parabollic profile
+Mg=round(Mg);
+printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,Mg);
+
+//answer in the book for normalized frequency is 23.55, deviation 0.05