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// Example 2.4.1 page 2.11
clc;
clear;
n1=1.49; //core refractive index
n2=1.45; //cladding refractive index
phi = asind(n2/n1); //computing critical angle
NA = sqrt(n1^2 - n2^2); //computing numericla aperture
theta= asind(NA); //computing acceptance angle
printf("\nCritical angle is %.2f degrees.\nNumerical aperture is %.3f.\nAcceptance angle is %.2f degree.",phi,NA,theta);
//answer in the book for Numerical aperture is 0.343, deviation of 0.003
//answer in the book for Acceptance angle is 20.24, deviation of 0.18
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