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// Scilab Code Ex3.21:: Page-3.34 (2009)
clc; clear;
a = 0.2; // Slit width, mm
b = 0.8; // Distance between slits, mm
p = [1 2 3 4]; // Orders of pth diffraction maxima
// As diffraction of pth diffraction maxima, a*sin(theta)=p*lambda --- (i)
// and that of nth diffraction maxima, (a+b)*sin(theta)=n*lambda --- (ii)
// Dividing (ii) by (i), we have
// (a+b)/a = n/p, solving for n
n = (a+b)/a*p; // Orders of nth diffraction maxima
printf("\nThe missing orders of spectra in diffraction maxima, n = %d, %d, %d, %d,...", n(1), n(2), n(3), n(4));
// Result
// The missing orders of spectra in diffraction maxima, n = 5, 10, 15, 20,...
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