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diff --git a/2411/CH3/EX3.d.313/Ex3d_13.sce b/2411/CH3/EX3.d.313/Ex3d_13.sce
new file mode 100755
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+++ b/2411/CH3/EX3.d.313/Ex3d_13.sce
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+// Scilab Code Ex3d.13: Page-210 (2008)
+clc; clear;
+lambda = 5000e-008;    // Wavelength of light, cm
+theta = 90;    // Angle of diffraction for the maximum resolving power, degree
+N = 40000;    // Number of lines on grating
+a_plus_b = 12.5e-005;    // Grating element, cm
+n = 2;    // Order of diffraction
+n_max = N*a_plus_b*sind(theta)/lambda;    // Maximum resolving power
+printf("\nThe maximum resolving power = %d", n_max);
+
+// Result
+// The maximum resolving power = 100000 
+\ No newline at end of file