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The zone plate behaves like a ___________

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The zone plate behaves like a ___________

(a) Concave Lens with multiple foci

(b) Convex Lens with multiple foci

(c) Convex Lens with single foci

(d) Concave Lens with single foci

I had been asked this question in semester exam.

Asked question is from Fresnel and Fraunhofer Diffraction in portion Diffraction of Engineering Physics II

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The correct option is (b) Convex Lens with multiple foci

The best explanation: In a zone plate, a much brighter image of an object is obtained at the screen, which shows the converging action of a zone plate. Also, it’s equation resembles that of a lens. Thus, the zone plate behaves like a convex lens with multiple foci.

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