The diaphragm with a circular hole with a diameter D = 4 mm is normally incident collimated monochromatic light beam (lambda = .5 micrometers). The observation point is at the axis of the hole at a distance b = 1 m from it. How many Fresnel zones fit in the hole? Dark or bright spot turn in the center of the diffraction pattern, if in place of the observations put the screen?
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