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clear
//
//
//
//Variable declaration
delta=0.0045; //relative difference
i0=0.115; //acceptance angle(radians)
v=3*10^8; //velocity of light(m/s)
//Calculations
NA=sin(i0); //numerical aperture
n1=NA/sqrt(2*delta); //core refractive index
vcore=v/n1; //velocity of light in fibre core(m/s)
//Result
printf("\n velocity of light in fibre core is %0.3f *10^8 m/s",vcore/10^8)
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