wrote:
Seems to me there must be power in the light rings and none in
the dark rings.

Yes

I am not sure where you get this notion of 'trapped',

:-) Good one :-) You say the power in a transmission line is trapped
between the zero power points and cannot cross the boundary. The
transmission line is virtually identical to the bright and dark
rings in a light interference pattern.

but if there is no power in the dark rings, then the power from
the light rings is certainly not in the dark rings.

Point is, the energy in the bright rings is not trapped there. It
continues to flow in a straight line. The bright rings and dark
rings are the result of interference between two beams of light
traveling in straight lines at the speed of light. The voltage-zero
and voltage-maximum points on a transmission line are the result of
interference between two waves traveling in straight lines at the
speed of light. In the absence of a physical impedance discontinuity,
there is nothing to change their momentum. Their momentum allows them
to "coast" across a voltage-zero point.
--
73, Cecil http://www.qsl.net/w5dxp



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