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+// Scilab Code Ex3.27:: Page-3.48 (2009)
+clc; clear;
+lambda = 6500e-008;    // Wavelength of light used, cm
+N = 10000;           // No. of lines per cm of grating, lines/cm
+a_plus_b = 1/N;         // Grating element, cm
+theta_n = 90;   // Direction for maximum possible orders, degrees
+// As (a+b)*sin(theta_n) = n*lambda, solving for theta for n
+n = a_plus_b*sind(theta_n)/lambda;  // Order of diffraction for 
+
+printf("\nThe order of diffraction for the given grating element and wavelength of light = %d", n);
+
+// Result 
+// The order of diffraction for the given grating element and wavelength of light = 1