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+// Scilab Code Ex7.3:: Page-7.8 (2009)

+clc; clear;

+n1 = 1.46;     // Refractive index of the core material

+delta = 0.01;   // Relative refractive index difference

+NA = n1*sqrt(2*delta);   // Numerical aperture for the fibre 

+theta_Q = %pi*NA^2;   // Solid acceptance angle of optical fibre for small angles, radians

+// As relative refractive index, delta = 1-n2/n1, solving for n2

+n2 = n1*(1-delta);   // Refractive index of cladding

+phi_C = asind(n2/n1);   // Critical angle of optical fibre, degrees

+

+printf("\nThe numerical aperture for the fibre  = %4.2f", NA);

+printf("\nThe solid acceptance angle of the optical fibre  = %4.2f radians", theta_Q);

+printf("\nThe critical angle of optical fibre = %4.1f degrees", phi_C);

+

+// Result 

+// The numerical aperture for the fibre  = 0.21

+// The solid acceptance angle of the optical fibre  = 0.13 radians

+// The critical angle of optical fibre = 81.9 degrees