Re: backward ray tracing

In article
<c76cef5f-e264-4f26-be29-e759e9033ff5@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Helpful person <rrllff@xxxxxxxxx> wrote:

I'm not familiar with Prof S., probably after my time.


I'm afraid I was probably *before* your time . . .

--Prof S. (still around, though fading steadily)


[But despite that, if anyone can point to a good, clear textbook
discussion of time-reversal symmetry in e-m and optics problems, that's
a favorite of theirs, and that specifically includes loss and gain, I'd
be glad to hear of it. I'm pretty sure I understand the topic, but I'd
be glad to check my understanding against someone else.]
.

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