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// Scilab Code Ex3.1:: Page-3.9 (2009)
clc; clear;
lambda = 5890e-008; // Wavelength of light used, cm
r1 = 0.2; // Radius of first ring of zone plate, cm
n = 1; // Order of zone plate
f1 = r1^2/(n*lambda); // Position of the screen so that light is focused on the brightest spot, cm
printf("\nThe position of the screen so that light is focused on the brightest spot = %3.1e cm", lambda);
// Result
// The position of the screen so that light is focused on the brightest spot = 5.9e-005 cm
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