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// Example 2.5.2
clc;
clear;
delta = 1.2/100; // Relative refractive difference index
n1=1.45; // Core refractive index
NA= n1*sqrt(2*delta); //computing numerical aperture
Acceptance_angle = asind(NA); //computing acceptance angle
si = %pi * NA^2; //computing solid acceptance angle
printf("\nNumerical aperture is %.3f.\nAcceptance angle is %.2f degree.\nSolid acceptance angle is %.3f radians.",NA,Acceptance_angle,si);
//answer in the book for Numerical aperture is 0.224, deviation of 0.001
//answer in the book for solid acceptance angle is 0.157, deviation of 0.002
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