1.

For a rectangular aperture of a*b the first null in E-plane occur at _______

A. sin<sup>-1</sup> u2061( /b)
B. sec<sup>-1</sup> u2061( /b)
C. cos<sup>-1</sup> u2061( /a)
D. sin<sup>-1</sup> u2061( /a)
Answer» B. sec<sup>-1</sup> u2061( /b)


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