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diff --git a/1871/CH4/EX4.8/Ch04Ex8.sce b/1871/CH4/EX4.8/Ch04Ex8.sce
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+// Scilab code Ex4.8 : Pg:146 (2008)
+clc;clear;
+D = 200;    // Distance between the source and the screen, cm
+Lambda = 5100e-08;    // Wavelength of light, cm
+x = 2;    // Separation of fringes, cm
+n = 10;    // number of fringes
+omega = x/n;    // Fringe width, cm
+d = D*Lambda/(2*omega);    // Double slit separation, mm
+printf("\nThe double slit separation = %4.2f mm", 2*d*10);
+
+// Result 
+// The double slit separation = 0.51 mm
+\ No newline at end of file