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clear
//
//
//
//Variable declaration
lamda=1.3; //wavelength(micro m)
n1=1.5; //core refractive index
Nm=1100; //number of modes
delta=0.01; //refractive index difference
//Calculations
d=lamda*sqrt(Nm/delta)/(%pi*n1); //diameter of fibre core(micro m)
//Result
printf("\n diameter of fibre core is %0.1f micro m",d)
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