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// Scilab Code Ex3.33:: Page-3.50 (2009)
clc; clear;
N = 12000; // No. of lines on the grating per inch, lines/inch
a_plus_b = 2.54/N; // Grating element, cm
n = 2; // Order of diffraction spectra
theta = 39; // Angle of diffraction for maxima in second order, degrees
// But a_plus_b*sind(theta)=n*lambda, solving for lambda
lambda = a_plus_b*sind(theta)/n; // Wavelength of light used, cm
printf("\nThe wavelength of light used in obtaining second order diffraction maximum = %4d angstrom", lambda/1e-008);
// Result
// The wavelength of light used in obtaining second order diffraction maximum = 6660 angstrom
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