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//Example 7_1
clc();
clear;
//To determine the no of modes propogating in the fiber
n1=1.48
n2=1.41
NA=sqrt(n1^2-n2^2)
d=60 //units in micro mts
lamda0=0.8 //units in micro mts
v=(%pi*d*NA)/lamda0
n=v^2/2
printf("Number of modes n=%.2f",n)
//In text book the answer given wrong as n=4.55*10^3 the correct answer is n=5615.50
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