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//variable declaration
a=5
n1=1.450
n2=1.447
lamda=1 //wavelength
//Calculations
N_a=(n1**2-n2**2) //Numerical aperture
N=4.9*((a*10**-6*sqrt(N_a)/(lamda*10**-6))**2)
//Result
printf('maximum no.of modes propogating through fiber =%0.3f \n',(N))
printf('Correction needed')
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