Jim Kelley wrote:
"In other words a system in which all of the power from the source
reaches the load and none is reflected back to the source without first
reflecting then re-reflecting would violate conservation of energy."

Conservation of energy means that energy is neither created nor
destroyed, but that heat and other forms of energy are quantitifiable
and convertable in their equivalence. The total amount of mechanical,
thermal, chemical, electrical, and other forms of energy in any isolated
system remains constant. A century ago, Einstein broadened the law to
include equivalence of mass and energy.

Regardless of reflections and re-reflections, all the energy sourced
into a transmission line ends up in the load if it isn`t lost in
transmission by radiation or conversion into heat. There`s no place else
for it to go.

Best regards, Richard Harrison, KB5WZI