Richard Harrison wrote:
All points on a wavefront are equidistant from the source and emerged
simultaneouslly so they share the same phase.. From a point source light
bulb we would be in the far field.

The big difference is that a light bulb doesn't emit
coherent light. Coherence is a requirement for
superposition and wave cancellation. The light bulb
example is simply irrelevant to what happens with
a single frequency coherent RF transmitter or a
single frequency coherent laser.
--
73, Cecil http://www.qsl.net/w5dxp


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