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+// Scilab Code Ex4.4 : Page-92 (2010)
+lambda = 650e-009;    // Wavelength of light used, m
+N = 6000e+02;    // Number of lines per m on grating, per m
+theta = 90;    // Angle at which the highest spectral order is obtained, degrees
+// We have sin(theta) = n*N*lambda, solving for n
+n = sind(theta)/(N*lambda);    // The highest order of spectra with diffraction grating
+printf("\nThe highest order of spectra obtained with diffraction grating = %1d", n);
+
+// Result 
+// The highest order of spectra obtained with diffraction grating = 2
+\ No newline at end of file