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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
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