The problem is that I need both realistic refraction and absorption; as
suggested in other threads, the correct way to get realistic refraction is
to slightly overlap the two objects (see for example
http://news.povray.org/povray.binaries.images/thread/%3C3E4E2A70.4060907@kimweb.de%3E/?ttop=189070&toff=1000
)
I agree that the overlap is unphysical, but coincident surfaces are out of
question, and a small gap gives multiple reflections & is also
unphysical...

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