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+// Scilab Code Ex4.1 : Page-91 (2010)

+D = 50;    // Distance between source and the screen, cm

+lambda = 6563e-008;    // Wavelength of light of parallel rays, m

+d = 0.385e-01;        // Width of the slit, cm

+n = 1;    // Order of diffraction for first minimum

+// As sin(theta1) = n*lambda/d = x1/D, solving for x1

+x1 = n*lambda*D/d;    // Distance from the centre of the principal maximum to the first minimum, cm

+printf("\nThe Distance from the centre of the principal maximum to the first minimum = %4.2f mm", x1/1e-001);

+n = 5;    // Order of diffraction for fifth minimum

+x2 = n*lambda*D/d;    // Distance from the centre of the principal maximum to the fifth minimum, cm

+printf("\nThe Distance from the centre of the principal maximum to the fifth minimum = %4.2f mm", x2/1e-001);

+

+// Result 

+// The Distance from the centre of the principal maximum to the first minimum = 0.85 mm

+// The Distance from the centre of the principal maximum to the fifth minimum = 4.26 mm
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