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Pisces, the reason I selected ‘surface bounce’ equal to zero was just to simplify the display. I assumed that surface refection would only become relevant in the creation of the 2nd. CZ.
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Took some time to think about this longer. But I don't thinks so. The convergence zone area at the surface is a small area. Which means that rays that strike the surface on the near end of (even the 1st) CZ reflect back down and immediatly reinforce the rays that come up to strike at the far side of the CZ. Which results in a lesser signal if reflection is off.
As an example see the following images:
With reflection:
No reflection!!!:
Strangely enough the center of the starpattern doesn't show increased signal level, but some of the arms do have higher dB levels
But to understand the paths the rays take it is smart to simplify this way and not get distracted.