Re: [PSUBS-MAILIST] One more reason to use acrylic windows.

["Sean T. Stevenson"<sts@telus.net>]

The "optical erasing" that you refer to is the result of the refractive index
of acrylic being closer to the surrounding water than other materials.

For reference, some approximate values are:

vacuum          1.0
fresh water     1.33
sea water       1.37
acrylic         1.49
glass           1.52
polycarbonate   1.58

-Sean
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