APPENDIX B
The Parallel-Ray Approximation
In Chapter 2, equations (2.3) and (2.4) give the electromagnetic fields due to a source on the z axis at the origin of coordinates. In Appendix A, we find what happens for various re-orientations of the source. In this Appendix, we find how to deal with a source moved away from the origin. Figure B.1 shows a field point at 
and a source point at 
’. The distance between them is the line R. The propagation part of the field expression is:
Figure B.1 Sketch showing general field point at and source point ...
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