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//Example 1.9.8 page 1.26
//To finf relative RI difference..
clc;
clear;
phiA = 8 // accepatance angle in degrees...
n1 =1.52; //RI of core...
NA = sind(phiA); //Numerical Aperture...
del = NA^2/(2*(n1^2)); //Relative RI difference...
printf("The relative refractive index difference is %.5f",del);
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