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is shown in Fig. 3.100. It has a central peak of value I0 = 1 at Su =0 and zero minima at ±n,±2n, The secondary maxima with values of (Su ) are given by the roots of the equation tan(Su ) — (Su ) = 0, as shown in Table 3.24. The first minimum corresponds to

Srq A

T7 = 2ym, so that an aperture with width n wavelengths gives a first minimum 1 /n rad away from the central maximum.

The appearance of the diffraction pattern arising from a rectangular aperture is shown in Fig. 3.101, reproduced from Born-Wolf and Lipson, Taylor and Thompson.

If the aperture becomes a slit by virtue of making 2ym ^ 2xm, the diffraction pattern in the y direction shrinks to negligible proportions and the one-dimensional pattern for a long slit results.

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