>Ior is a property of a material. Reflection is a property of a
surface.<
Hmm, actually, they can both be considered properties of the boundaries
between two materials(and the same substance at a different temperature
could be considered a different material.) And gaseous materials do
reflect light, although usually in small amounts.(although clouds, fog,
etc are not examples of this because they are droplets of liquid
suspended in the air.)
Of course, this has nothing to do with the way POV considers it...

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