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diff --git a/1871/CH4/EX4.12/Ch04Ex12.sce b/1871/CH4/EX4.12/Ch04Ex12.sce
new file mode 100755
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+// Scilab code Ex4.12: Pg:149 (2008)
+clc;clear;
+Lambda = 6500e-007;    // Wavelength of light, mm
+Lambda_prime = 5200e-007;    // New wavelength of light, mm
+n = 3;    // Order of bright fringe
+D = 1200;    // Distance between the source and the slits, mm
+d = 2/2;    // Separation between teh slits, mm
+x3 = n*Lambda*D/(2*d);    // The distance of the third bright fringe from the central maximum, mm
+n = 5;        // Minimum value of n 
+m = Lambda_prime/Lambda*n;    // Minimum value of m 
+x4 = m*Lambda*D/(2*d);    // The least distance from the central maximum at which bright fringes duw to both the wavelengths coincide, mm
+printf("\nThe distance of the third bright fringe from the central maximum = %4.2f mm", x3);
+printf("\nThe least distance from the central maximum at which bright fringes duw to both the wavelengths coincide = %5.3f cm", x4/10);
+
+// Result 
+// The distance of the third bright fringe from the central maximum = 1.17 mm
+// The least distance from the central maximum at which bright fringes duw to both the wavelengths coincide = 0.156 cm 
+\ No newline at end of file