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+// Scilab code Ex4.10: Pg:147 (2008)
+clc;clear;
+delta_D = 5e-002;    // Distance through which the screen is moved, m
+delta_omega = 3e-005;    // Change in fringe width as a result of motion of screen, m
+d = 1e-003/2;    // Half of the separation distance between the slits, m
+// As delta_omega = lambda*delta_D/(2*d), solving for lambda
+lambda = delta_omega*(2*d)/delta_D;    // Wavelength of light used, m
+printf("\nThe wavelength of light used = %4d angstrom", lambda/1e-010);
+
+// Result 
+// The wavelength of light used = 6000 angstrom