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2Ji(kpmw)

kpmw

where I0 = C2A2 = EA/A2, with A = np2m and E the total energy incident on the aperture, is the intensity at the central point of the pattern. The form of (3.442) is therefore similar to the result (3.438) for the slit, with the important difference that the sine is replaced by the Bessel function J1 . Figure 3.102 shows the function 2

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