Question: A point source of monochromatic light is positioned in front of a zone plate at a distance a = 1.5 m from it. The image

A point source of monochromatic light is positioned in front of a zone plate at a distance a = 1.5 m from it. The image of the source is formed at a distance b = 1.0 m from the plate. Find the focal length of the zone plate.

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