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+// Scilab Code Ex3.4:: Page-3.11 (2009)
+clc; clear;
+lambda = 1;     // For simplicity assume wavelength of light used to be unity, unit
+R = 150;        // Radius of curvature of the curved surface, cm
+r1 = sqrt(lambda*R);    // For Newton's ring, cm
+f1 = r1^2/lambda;       // Principal focal length of zone plate, cm
+
+printf("\nThe principal focal length of zone plate = %3d cm", f1);
+
+// Result 
+// The principal focal length of zone plate = 150 cm