This solution assumes that the delta function source is located at the origin. If the source is located at an arbitrary source point, denoted by the vector and the field point is located at the point , then we may represent the scalar Green's function (for arbitrary source location) as

upright=1.4In the far field, where is large the Green's function simplifies toThe expression for the far (Fraunhofer region) wave then becomes

with an

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