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clear
//
//
//
//Variable declaration
d=5*10**-6 //diameter(m)
n2=1.447 //refractive index of cladding
n1=1.45 //refractive index of core
lamda=1*10**-6 //wavelength(m)
//Calculation
NA=sqrt(n1**2-n2**2) //numerical aperture
N=4.9*(d*NA/lamda)**2 //total number of guided modes
//Result
printf("\n total number of guided modes is %0.3f ",N)
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