Babinet’s principle. A monochromatic beam of parallel light is incident on a “collimating” hole of diameter x ≫ λ. 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.
Figure 36-39 Problem 16.
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