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+// Scilab Code Ex3.13:: Page-3.25 (2009)
+clc; clear;
+a = 0.045;       // Slit width, cm
+lambda = 5500e-008;     // Wavelength of light used, cm
+f = 250;        // Focal length of the lens, cm
+x = lambda*f/a;     // Position of central maxima, cm
+
+printf("\nThe position of central maxima = %5.3f cm", x);
+printf("\nThe width of central maxima from first minima = %5.3f cm", 2*x);
+
+// Result 
+// The position of central maxima = 0.306 cm
+// The width of central maxima from first minima = 0.611 cm