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// Scilab Code Ex3.11:: Page-3.25 (2009)
clc; clear;
lambda = 5500e-008; // Wavelength of light used, cm
a = 8.5e-005; // Width of the slit, cm
n = 1; // Order of diffraction
// For a single slit Fraunhofer diffraction, a*sind(theta) = n*lambda, solving for theta
theta = asind(n*lambda/a); // Half angular width at central maximum in Fraunhoffer diffraction, degrees
printf("\nThe half angular width at central maximum in Fraunhoffer diffraction = %4.1f degrees", theta);
// Result
// The half angular width at central maximum in Fraunhoffer diffraction = 40.3 degrees
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