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+// Scilab Code Ex3.24: : Page-3.46 (2009)

+clc; clear;

+lambda1 = 5890e-008;    // Wavelength of D1 line, cm

+lambda2 = 5896e-008;    // Wavelength of D2 line, cm

+N = 15000;           // No. of lines per inch of grating, lines/inch

+a_plus_b = 2.54/N;         // Grating element, cm

+n = 2;      // Order of diffraction for secondary maxima

+// As (a+b)*sin(theta_n) = n*lambda, solving for theta1 and theta2

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

+theta2 = asind(n*lambda2/a_plus_b);     // Direction of secondary maxima with lambda2, degrees

+

+printf("\nThe angle of separation in second order diffraction spectrum = %3.1f degrees", theta2-theta1);

+

+// Result 

+// The angle of separation in second order diffraction spectrum = 0.1 degrees