Rohan Bernett wrote:
>I know the IORs of water and glass are 1.33 and 1.5, but there are a number
>of materials that it would be handy to know the IORs for.
>
>Perspex
>PET (plastic, recycling number 1)
>Pyrex
>Quartz glass
>
>If anyone can give the IORs of these substances (and any others) please
>reply to this message with them.
>
>Rohan _e_ii
>
I don't know the IOR of pyrex but I _do_ know it is essentially equal to
that of Wesson Corn Oil.  Really.  Submerge a pyrex lab beaker in a bowl
full of Wesson, and the beaker disappears.  It's the coolest physics demo I
do in my class.

To be marginally more useful, this site (<a
href="http://www.rom.on.ca/wwatch/teachers-kit/disappearing.html">http://www.rom.on.ca/wwatch/teachers-kit/disappearing..html</a>)
claims that the index of Wesson Oil and of pyrex is 1.474.

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