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+// Scilab Code Ex7.1:: Page-7.7 (2009)
+clc; clear;
+n1 = 1.6;       // Refractive index of core material of fibre
+n2 = 1.3;       // Refractive index of cladding material of fibre
+phi_C = asind(n2/n1);   // Critical angle of optical fibre, degrees
+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 angle of acceptance cone = %5.1f degrees", 2*theta_Q);
+
+// Result 
+// The critical angle of optical fibre = 54.3 degrees
+// The angle of acceptance cone = 137.7 degrees