Art Unwin wrote:

Equilibrium is when there is no gain. When this occurs there is
polarisation purity.
Gain is not a factor in equilibrium so why muddy up the question. Or
is that being arrogant
because you disagree with me LOL

Another data point. Or better put, Art's babbling for today.

So now we have

Equilibrium ==

1) no reflections.

2) isotropic.

3) no gain.

Keep going Art.

If I missed one, step in Dave.

tom
K0TAR