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+// Scilab Code Ex3.6:: Page-3.23 (2009)

+clc; clear;

+lambda = 5000e-010;     // Wavelength of light used, cm

+n = 1;      // Order of diffraction

+x = 5e-003;     // Position of first minima on either sides of central maximum, m

+D = 2.5;    // Distance of screen from the narrow slir, m

+sin_theta = x/sqrt(x^2+D^2);    // Sine of angle theta, rad

+// For a single slit Fraunhofer diffraction, a*sin(theta) = n*lambda, solving for a

+a = n*lambda/sin_theta;     // Width of the slit, m

+

+printf("\nThe Width of the slit = %3.1e m", a);

+

+// Result 

+// The Width of the slit = 2.5e-004 m