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+// Scilab Code Ex12.3: Numerical aperture and acceptance angle of step index fibre : Page-271 (2010)
+n1 = 1.55;    // Refractive index of fibre core
+n2 = 1.53;    // Refractive index of fibre cladding
+n0 = 1.3;    // Refractive index of medium
+NA = sqrt(n1^2 - n2^2);    // Numerical aperture for optical fibre
+// n0*sin(theta_a) = sqrt(n1^2 - n2^2) = NA, solving for theta_a
+theta_a = asind(sqrt(n1^2 - n2^2)/n0);    // Half of acceptance angle of optical fibre, degrees
+theta_accp = 2*theta_a;    // Acceptance angle of optical fibre
+printf("\nNumerical aperture for step index fibre = %5.3f", NA);
+printf("\nThe acceptance angle of step index fibre = %2d degrees", theta_accp);
+
+// Result
+// Numerical aperture for step index fibre = 0.248
+// The acceptance angle of step index fibre = 22 degrees 
+\ No newline at end of file