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+// Scilab Code Ex3.29:: Page-3.48 (2009)

+clc; clear;

+lambda = 6328e-008;    // Wavelength of He-Laser, cm

+a_plus_b = 1/6000;      // Grating element, cm

+n = 1;      // First order of diffraction for given wavelength

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

+theta1 = asind(n*lambda/a_plus_b);      // Angle at which first order maximum is observed, degrees

+n = 2;      // second order of diffraction for given wavelength

+theta2 = asind(n*lambda/a_plus_b);      // Angle at which second order maximum is observed, degrees

+

+printf("\nThe angle at which first order maximum is observed = %4.1f degrees", theta1);

+printf("\nThe angle at which second order maximum is observed = %4.1f degrees", theta2);

+

+// Result 

+// The angle at which first order maximum is observed = 22.3 degrees

+// The angle at which second order maximum is observed = 49.4 degrees