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//chapter12,Example12_3,pg 357
NA=0.5
n1=1.54
n2=sqrt((n1^2)-(NA^2))
printf("refractive index of cladding\n")
printf("n2=%.2f ",n2)
n=(n1-n2)/n1//relative change in refractive index of core
printf("\nrelative change refractive index of core\n")
printf("n=%.2f ",n)
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