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//Variable declaration
NA=0.39; //numerical aperture
n1_n2=0.05; //difference in refractive indices
//Calculation
x=NA**2/n1_n2;
n2=(x-n1_n2)/2; //refractive index of cladding
n1=n2+n1_n2; //refractive index of core
//Result
printf('refractive index of core is %0.3f \n',n1)
printf('refractive index of cladding is %0.3f \n',n2)
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