26. In the screen with a circular hole of radius r = 1,

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26. In the screen with a circular hole of radius r = 1,5 mm is normally incident parallel beam of monochromatic light of wavelength λ = 0,5 mm. The observation point is on the axis of the hole at a distance b = 1,5 m from it. Determine: 1) the number of Fresnel zones fit into the hole; 2) dark or bright ring seen in the center of the diffraction pattern when placed at the point of the screen.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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