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+// Scilab Code Ex4.5 : Page-92 (2010)
+N = 4000e+02;    // Number of lines per m on grating, per m
+// For Blue Line
+lambda = 450e-009;    // Wavelength of blue light, m
+n = 3;    // Order of diffraction spectrum
+// We have sin(theta) = n*N*lambda, solving for sin(theta)
+sin_theta_3 = n*N*lambda;    // Sine of angle at third order diffraction 
+// For Red Line
+lambda = 700e-009;    // Wavelength of blue light, m
+n = 2;    // Order of diffraction spectrum
+// We have sin(theta) = n*N*lambda, solving for sin(theta)
+sin_theta_2 = n*N*lambda;    // Sine of angle at second order diffraction
+// Check for overlapping
+if abs(sin_theta_3 - sin_theta_2) < 0.05 then
+    printf("\nThe two orders overlap.");
+else
+    printf("\nThe two orders do not overlap.");
+end
+
+// Result 
+// The two orders overlap. 
+\ No newline at end of file