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+// Scilab Code Ex3.26:: Page-3.47 (2009)

+clc; clear;

+lambda = 5000e-008;    // Wavelength of light used, cm

+N = 5000;           // No. of lines per cm of grating, lines/cm

+a_plus_b = 1/N;         // Grating element, cm

+n = 1;      // Order of diffraction for first order spectra

+// As (a+b)*sin(theta_n) = n*lambda, solving for theta for first and third orders

+theta1 = asind(n*lambda/a_plus_b);     // Direction of principal maxima with lambda1, degrees

+n = 3;      // Order of diffraction for third order spectra

+theta3 = asind(n*lambda/a_plus_b);     // Direction of principal maxima with lambda2, degrees

+delta_theta = theta3 - theta1;  // Angular separation in the first and third order spectra, 

+

+printf("\nThe difference in the deviation in the first and third order spectra = %4.1f degrees", delta_theta);

+

+// Result 

+// The difference in the deviation in the first and third order spectra = 34.1 degrees