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// Example 2.3.1 page 2.10
clc;
clear;
delta = 1/100; // Relative refractive difference index
n1=1.46; // Core refractive index (assumption)
NA= n1*sqrt(2*delta); //computing numerical aperture
theta = 1 - delta;
Critical_angle = asind(theta); //computing critical angle
printf("\nNumerical aperture is %.2f.\nCritical angle is %.1f degree.",NA,Critical_angle);
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