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//variable declaration
d=50 //diameter
n1=1.450
n2=1.447
lamda=1 //wavelength
//Calculations
N_a=(n1**2-n2**2) //Numerical aperture
N=4.9*(((d*10**-6*N_a)/(lamda*10**-6))**2)
//Results
printf('Numerical aperture =%0.3f ',N_a)
printf('No. of modes that can be propogated =%0.3f \n',(N))
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