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+// Scilab Code Ex8.4: Page-398 (2008)
+clc; clear;
+NA = 0.5;   // Numerical aperture of the optical fibre
+n1 = 1.54;  // Refractive index of the core material
+n2 = sqrt(n1^2-NA^2);   // Refractive index of the cladding in an optical fibre
+printf("\nThe refractive index of the cladding in the optical fibre = %4.2f", n2);
+
+// Result 
+// The refractive index of the cladding in the optical fibre = 1.46