Cecil Moore wrote in
et:

....
So to answer your question: The 50 ohm virtual impedance at point
y is incapable of causing reflections even though it has an identical
V/I ratio to point x. The physical impedance discontinuity at x is
fully capable of causing reflections along with the ensuing
interference.

....

Cecil, I don't understand what you mean by 'virtual impedance', why and how
it differs from equivalent impedance (being the complex ratio of V/I at a
point), and why it has these magical relection properties. Perhaps it is
just an invention to support your proposition.

Given that my statement was qualified to the steady state, your inisistence
that point x is different in behaviour to point y says to me you are
silently changing scope to transient conditions to confuse the reader.

Owen