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//Example 5.13, Page number 5.31
clc;clear;close
// variable declaration
alpha=1.85//unitless
lamda=1.3*10**-6 // in m
a=25*10**-6 // in m
N_a=0.21 // numerical aperture
// Calculations
V_n=((2*%pi**2)*a**2*N_a**2)/lamda**2 // V number
N_m=(alpha/(alpha+2))*V_n //unitless
printf("No.of modes = %.2f =155(approx)",N_m)
printf("\nTaking the two possible polarizations, Total No.of nodes = %.2f",(N_m*2))
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