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// Example 2.8.4
clc;
clear;
NA=0.16 //Numerical aperture
n1=1.45 //core refractive index
d=60d-6 //core diameter
lamda=0.82d-6 //wavelength
a=d/2; //core radius
v=2*3.14*a*NA/lamda; //computing normalized frequency
v=round(v);
M=v^2/2; //computing guided modes
M=floor(M);
printf("if normalized frequency is taken as %d, then %d guided modes.",v,M);
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