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1) In a real optical medium, we are quite likely to have some resonators
for which the drive is below their resonant frequency, *and* some for which
the same drive is above their resonant frequency. For example, look at the
absorption spectrum of water. Here is a graph
http://www.deas.harvard.edu/~jones/es151/pages/gallery/images/water_spec.
http://www.deas.harvard.edu/~jones/es151/pages/gallery/images/water_spec.html
that somebody lifted from page 291 of Jackson, _Classical
Electrodynamics_. We see that throughout most of the optical band, the
absorption is dominated by the shoulder of resonators that lie at !lower!
frequencies.
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