Cecil Moore wrote:

Jim Kelley wrote:

Nor do they interfere and then suddenly decide to truck along in a
different direction.


But during wave cancellation, as described by the Melles-Groit
and FSU web pages, the conservation of energy principle leaves
them no choice but that their energy be redistributed in a
different direction toward which constructive interference
can occur.

How energy redistribution is described on those web sites in not a
matter of contention.

73, ac6xg