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// Example 2.12
// Computation of (a) numerical aperature and (b) maximum angle of entrance
// Page no 482
clc;
clear;
close;
//Given data
n1=1.48; // Refractive index of core
n2=1.46; // Refractive index of cladding
// (a) Numerical Aperture
NA=sqrt(n1^2-n2^2);
//(b) Maximum angle of entrance
theata=asind(NA);
//Displaying result in the command window
printf("\n Numerical Aperture = %0.3f ",NA);
printf("\n Maximum angle of entrance (degress) = %0.0f ",theata);
// Final answer in the book is wrong. Please refer example 2.11 of
// Fiber Optic Communication by Gerd Keiser book.
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