Tom Melly wrote:

> Anyone know what the ior for saltwater is? 1.4? 1.38? 1.45? (roughly -
> presumably it depends on how salty).

Googling:

Index of refraction of water:
http://www.reefnet.on.ca/gearbag/wwwh2o.html (table 2)

Various substances:
http://hyperphysics.phy-astr.gsu.edu/hbase/tables/indrf.html (doesn't 
include saltwater, though)

In short:

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