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// Example 2.8.7
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
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