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// Ex16_1 Page:306 (2014)
clc;clear;
n1 = 1.43; // Refractive index of core
n2 = 1.40; // Refractive index of cladding
theta_c = acosd(n2/n1); // Propagation angle, degree
NA = sqrt(n1^2 - n2^2); // Numerical aperture
theta_a = asind(NA); // Acceptance angle, degree
printf("\nPropagation angle = %4.1f degree", theta_c);
printf("\nNumerical aperture = %6.4f", NA);
printf("\nAcceptance angle = %5.2f degree", 2*theta_a);
// Result
// Propagation angle = 11.8 degree
// Numerical aperture = 0.2914
// Acceptance angle = 33.88 degree
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