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diff --git a/2411/CH3/EX3.d.305/Ex3d_5.sce b/2411/CH3/EX3.d.305/Ex3d_5.sce
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+++ b/2411/CH3/EX3.d.305/Ex3d_5.sce
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+// Scilab Code Ex3d.5: Page-207 (2008)
+clc; clear;
+N = 4250;    // Number of lines per cm of grating, lines/cm
+a_plus_b = 1/N;    // Grating element, cm
+n = 2;    // Order of diffraction
+theta = 30;    // Angle of diffraction, degree
+lambda = sind(theta)*a_plus_b/n;    // Wavelength of spectral line from diffraction condition, cm
+printf("\nThe wavelength of spectral line from diffraction condition = %4d angstrom", lambda/1e-008);
+
+// Result
+// The wavelength of spectral line from diffraction condition = 5882 angstrom 
+\ No newline at end of file