Cecil Moore wrote:
Gene Fuller wrote:
You got it right. There is no "inside" to a plane. There is also
nothing that happens exactly in that "plane".

Conceptually, it happens exactly *at* that plane. For
instance, in the following example, a plane is drawn
through the connection points which can be made as
physically small as needed - certainly small enough that
nothing needs to be hidden inside a black box in order
to obfuscate the technical facts.

I highly recommend the lengthy message just posted by Richard Clark. It
captures quite nicely what I have been merely hinting at. In summary,
"conceptually" simply doesn't cut it for resolving the fine details of
reflections. Nothing happens exactly *at* a plane in the real world. And
this is not just a "dx" or "dt" type issue. Real things happen over real
distances.

73,
Gene
W4SZ