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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