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+// To find acceptance angle and numerical aperture

+// Modern Electronic Instrumentation And Measurement Techniques

+// By Albert D. Helfrick, William D. Cooper

+// First Edition Second Impression, 2009

+// Dorling Kindersly Pvt. Ltd. India

+// Example 14-1 in Page 392

+

+

+clear; clc; close;

+

+// Given data

+n_2 = 1.45; //Core index of refraction

+n_1 = 1.47; //Cladding index of refraction

+

+//Calculation

+theta_c = acos(n_2/n_1);

+theta_A = 2*asin(n_1*sin(theta_c));

+NA = sqrt(n_1^2 -n_2^2);

+

+printf("The critical angle of the fiber = %0.2f degree\n",theta_c*180/%pi);

+printf("The acceptance angle of the fiber = %0.2f degree\n",theta_A*180/%pi);

+printf("The numerical aperture of the fiber = %0.3f ",NA);

+

+//Result

+// The critical angle of the fiber = 9.46 degree

+// The acceptance angle of the fiber = 27.97 degree

+// The numerical aperture of the fiber = 0.242  

+

+

diff --git a/174/CH14/EX14.1/example14_1.txt b/174/CH14/EX14.1/example14_1.txt
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+The critical angle of the fiber = 9.46 degree

+The acceptance angle of the fiber = 27.97 degree

+The numerical aperture of the fiber = 0.242