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clear
//
//
//
//Variable declaration
V=2.405; //V-number
lamda=8500*10^-10; //wavelength(m)
n1=1.48; //core refractive index
n2=1.47; //cladding refractive index
//Calculations
d=V*lamda/(%pi*sqrt(n1^2-n2^2)); //diameter of core(m)
//Result
printf("\n diameter of core is %0.2f *10^-6 m",d*10^6)
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