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//Example 5.2, Page number 5.28
clc;clear;close
//variable declaration
d=50 //diameter
N_a=0.2 //Numerical aperture
lamda=1 //wavelength
//Calculations
N=4.9*(((d*10**-6*N_a)/(lamda*10**-6))**2)// unitless
//Result
printf("N = %.f ",N)
printf("\nFiber can support: %d guided modes",N)
printf("\nIn graded index fiber, No.of modes propagated inside the fiber = %.f only",(N/2))
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