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+// Scilab Code EX3.39:: Page-3.55 (2009)
+clc;clear;
+lambda1 = 5890e-008;  // Wavelength of sodium D1 line, cm
+lambda2 = 5896e-008;  // Wavelength of sodium D2 line, cm
+d_lambda = lambda2-lambda1; // Difference in the wavelength of two lines, cm
+n = 2;  // Order of diffraction
+// As lambda/d_lambda = n*N, solving for N
+N = lambda1/(d_lambda*n);  // Minimum number of lines in a grating
+printf("\nThe minimum number of lines in a grating = %3d lines", N);
+
+// Result
+// The minimum number of lines in a grating = 490 lines