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diff --git a/2411/CH3/EX3.d.304/Ex3d_4.sce b/2411/CH3/EX3.d.304/Ex3d_4.sce
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+// Scilab Code Ex3d.4: Page-206 (2008)
+clc; clear;
+lambda1 = 5890e-008;    // Wavelength of D1 line of sodium lamp, cm
+lambda2 = 5896e-008;    // Wavelength of D2 line of sodium lamp, cm
+d_lambda = lambda2 - lambda1;    // Wavelength difference, cm
+w = 0.5;    // Width of the grating, cm
+N = 2500;    // Total number of grating lines
+N_prime = N/w;    // Number of lines per cm, lines/cm
+a_plus_b = 1/N_prime;    // Grating element, cm
+n = 1;    // Order of diffraction
+// Case 1
+theta = asind(n*lambda1/a_plus_b);    // Angle of diffraction for D1 line, degree
+// Case 2
+theta_prime = asind(n*lambda2/a_plus_b);    // Angle of diffraction for D2 line, degree
+printf("\nThe angle of diffraction for D1 and D2 lines of sodium are %5.2f dgree and %5.2f degree respectively.", theta, theta_prime);
+// From the condition for just resolution, lambda/d_lambda = n*N, solving for N
+N_min = lambda1/(d_lambda*n);    // Minimum number of lines required on the grating
+if N_min < N then
+    printf("\nThe two lines are well resolved.");
+else
+    printf("\nThe two lines are not resolved.");
+end
+
+// Result
+// The angle of diffraction for D1 and D2 lines of sodium are 17.13 dgree and 17.15 degree respectively.
+// The two lines are well resolved. 
+\ No newline at end of file