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diff --git a/2411/CH3/EX3.d.303/Ex3d_3.sce b/2411/CH3/EX3.d.303/Ex3d_3.sce
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+++ b/2411/CH3/EX3.d.303/Ex3d_3.sce
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+// Scilab Code Ex3d.3: Page-206 (2008)
+clc; clear;
+n = 1;    // Order of diffraction
+f = 40;    // Focal length of the lens, cm
+a = 0.03;    // Slit width, cm
+lambda = 5890e-008;    // Wavelength of the light used, cm
+// As a*sind(theta) = n*lambda, solving for theta
+theta = asin(n*lambda/a);    // The angle of diffraction corresponding to the first minimum, radian
+x = f*theta;    // The distance of the first dark band from the axis, cm  
+printf("\nThe distance of the first dark band from the axis = %6.4f cm", x);
+
+// Result
+// The distance of the first dark band from the axis = 0.0785 cm 
+\ No newline at end of file