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+// Scilab Code Ex3.2:: Page-3.9 (2009)

+clc; clear;

+v1 = 36;     // Position of the strongest image from the zone plate, cm

+v2 = 9;     // Position of the next image from the zone plate, cm

+lambda = 5890e-008;  // Wavelength of light used, cm

+r1 = 1;   // For simplicity assume radius of first ring of zone plate to be unity, cm

+n = 1;  // Order of zone plate

+// As 1/v1-1/u = n*lambda/r1^2 = 1/3*(1/v2-1/u), solving for u

+u = 2/(3/36-1/9);       // Distance of the zone plate from source, cm

+// As 1/v-1/u = n*lambda/r1^2, solving for r1

+r1 = sqrt(lambda/(1/v1-1/abs(u)));       // Radius of first zone, cm

+f1 = r1^2/(n*lambda);   // Principal focal length, cm

+

+printf("\nThe distance of the zone plate from source = %2d cm", u);

+printf("\nThe radius of first zone = %3.1e cm", r1);

+printf("\nThe principal focal length = %4.1f cm", f1);

+

+// Result 

+// The distance of the zone plate from source = -72 cm

+// The radius of first zone = 6.5e-002 cm

+// The principal focal length = 72.0 cm