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## Zero-aperture bearings in two-ray wave-fields

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In this chapter we shall consider the 'bearing' defined by the normal to a curve of constant phase (CP) at a particular point in a two-ray wave-field. It must be emphasised that 'bearing' is thus being given a very special meaning; it is a geometrical property of the wave-field. In effect, we consider the bearing indicated by a phase-sensitive DF as its aperture shrinks to zero. Because this limiting case is an abstraction, we can continue to postpone any consideration of the behaviour of particular types of instrument; we are still dealing with the inherent properties of the field. Nevertheless, a number of general results can be derived that provide a useful insight into more practical situations.

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