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//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)
//Result
printf('N =%0.3f \n',N)
printf('Fiber can support%0.3f guided modes \n',N)
printf('In graded index fiber, No.of modes propogated inside the fiber =%0.3f only',N/2)
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