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// Example 1.9.2 page 1.23
// To calculate Numerical aperture and Acceptance angle...
clc;
clear;
n1= 1.5 // RI of core
n2 = 1.48 // RI of cladding..
NA = sqrt((n1^2)-(n2^2));
printf('The Numerical Aperture is %.2f',NA);
phiA = asind(NA);
printf('\n\nThe Critical angel is %.2f degrees',phiA);
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