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clear
//
//
//
//Variable declaration
d=50*10**-6 //diameter(m)
NA=0.2 //numerical aperture(m)
lamda=1*10**-6 //wavelength(m)
//Calculation
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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