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//Example 1.14.1 page 1.41
// To calculate the number of modes...
clc;
clear;
d = 50*10^-6; // diameter of fibre...
n1 = 1.48; //RI of core..
n2 = 1.46; //RI of cladding..
lamda = 0.82*10^-6; //wavelength of light..
NA = sqrt(n1^2-n2^2); // Numerical Aperture..
Vn= %pi*d*NA/lamda; //normalised frequency...
M = Vn^2/2; // number of modes...
printf(" The number of modes in the fibre are %d",M);
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