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+// Scilab Code Ex7.2:: Page-7.8 (2009)

+clc; clear;

+n1 = 1.50;       // Refractive index of core material of fibre

+n2 = 1.47;       // Refractive index of cladding material of fibre

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

+NA = sqrt(n1^2-n2^2);   // Numerical aperture for the fibre 

+theta_Q = asind(sqrt(n1^2-n2^2));   // Acceptance angle of optical fibre, degrees

+

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

+printf("\nThe numerical aperture for the fibre  = %5.3f", NA);

+printf("\nThe angle of acceptance cone  = %5.1f degrees", theta_Q);

+

+// Result 

+// The critical angle of optical fibre = 78.5 degrees

+// The numerical aperture for the fibre  = 0.298

+// The angle of acceptance cone  =  17.4 degrees