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+// Scilab Code EX3.41:: Page-3.56 (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; // Wavelength difference, cm
+n = 2;      // Order of diffraction
+// As lambda/d_lambda = n*N, solving for N
+N = 1/n*(lambda1+lambda2)/(2*d_lambda);    // Minimum required number of lines on the plane transmission grating
+
+printf("\nThe minimum required number of lines on the plane transmission grating = %3d", N);
+
+// Result
+// The minimum required number of lines on the plane transmission grating = 491