Babinets principle. A monochromatic beam of parallel light

Chapter , Problem 16

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Babinets principle. A monochromatic beam of parallel light is incident on a collimating hole of diameter . Point P lies in the geometrical shadow region on a distant screen (Fig. 36-39a). Two diffracting objects, shown in Fig. 36-39b, are placed in turn over the collimating hole. Object A is an opaque circle with a hole in it, and B is the photographic negative of A. Using superposition concepts, show that the intensity at P is identical for the two diffracting objects A and B

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