Jim Kelley wrote:
I don't think we should expect to see any momentum "calculations" from
Cecil. He can't even explain how the energy magically reverses
direction and heads back toward the load.

It's not magic and is explained on the Melles-Groit web page at:

http://www.mellesgriot.com/products/optics/oc_2_1.htm

Here's a quote: "Clearly, if the wavelength of the incident light and the
thickness of the film are such that a phase difference exists between reflections
of p, then REFLECTED WAVEFRONTS INTERFERE DESTRUCTIVELY, and overall reflected
intensity is a minimum. If the two reflections are of equal amplitude, then this
amplitude (and hence intensity) minimum will be ZERO."

Destructive interference stops the energy flow and momentum of the two reflected
waves toward the source (at the Z0-match point 'x' below.

Continuing: "In the absence of absorption or scatter, the principle of conservation
of energy indicates all "lost" reflected intensity will appear as ENHANCED INTENSITY
(constructive interference) in the transmitted beam" (traveling toward the load).

The energy involved in the destructive interference is not lost and appears as
constructive interference in the opposite direction. That energy has changed
direction and had its momentum reversed.

The fact is, in a matched system, energy obviously isn't reflected from the load.

No reflections from the load? Neglecting losses, I calculate 178 watts reflected
from the load and 278 watts of forward power on the 450 ohm feedline in the
following matched system.

100w XMTR---50 ohm feedline---x---1/2WL 450 ohm feedline---50 ohm load
--
73, Cecil http://www.qsl.net/w5dxp



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