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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
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