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+// Scilab code Ex4.9: Pg:147 (2008)

+clc;clear;

+D = 1000;    // Distance between the source and the screen, mm

+omega = 1;    // For simplicity assume fringe width to be unity, mm

+x9 = 9*omega;    // Position of 9th bright fringe, mm

+x2_prime = 3/2*omega;    // Position of 9th bright fringe, mm

+d = 0.5/2;    // Separation between the slits, mm

+l = 8.835;    // Distance between 9th bright fringe and second dark fringe

+// As x9 - x2_prime = 9*omega-3/2*omega = l, solving for omega

+omega = l/(x9 - x2_prime);    // Fringe width, mm

+lambda = omega*2*d/D;    // Wavelength of light used, mm

+printf("\nThe wavelength of light used = %4d angstrom", lambda/1e-007);

+

+// Result 

+// The wavelength of light used = 5890 angstrom