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+// Scilab Code Ex2.63:: Page-2.49(2009)
+clc; clear;
+R1 = 4;       // Radius of curvature of the convex surface, m
+R2 = 5;       // Radius of curvature of the concave surface, m
+lambda = 6600e-010; // Wavelength of light used, cm
+n = 15;     // Order of Newton ring
+// As D_n^2*(1/R1-1/R2) = 4*n*lambda, solving for D_n
+D_15 = sqrt(4*n*lambda/(1/R1-1/R2));     // Diameter of 15th dark ring, cm
+
+printf("\nThe diameter of %dth dark ring = %4.2e m", n, D_15);
+
+// Result
+// The diameter of 15th dark ring = 2.81e-002 m 
+// The answer is given wrong in the textbook (the square root is not solved)