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//Example 5.6, Page number 5.29
clc;clear;close
// variable declaration
a=100//unitless
N_a=0.3 // Numerical aperture
lamda=850 // wavelength
// Calculations
V_n=(2*(%pi)**2*a**2*10**-12*N_a**2)/lamda**2*10**-18 // number of modes
// Result
printf("Number of modes = %d modes",round(V_n/10**-36))
printf("\nNo.of modes is doubled to account for the two possible polarisations")
printf("\nTotal No.of modes = %d",round(V_n/10**-36)*2)
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