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°.94

This expression was first derived by Rayleigh (1881) and is shown in Fig. 3.5 [Mat.3.3] One clearly sees the plateaux at the positions of the dark rings of the Airy pattern. If u0 coincides with a null of the pattern we have J1 (u0) = 0 and the power outside that radius simply is equal to J02 (u0). The main beam, up to the first null, contains 84 percent of the total radiated energy. Numerical data are assembled in Table 3.1.

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