The docs dont refer to the dispersion check box in Vray material
WTF is Abbe?
Raj
The docs are still being updated.
If you are after a detailed description of it look here-
http://en.wikipedia.org/wiki/Dispersion\_(optics)
Or if you want images look here-
I found that link too, but thanks. To save some people time (who are reading this thread) the higher the dispersion number the LESS dispersion phenomenon there is. Most ordinary quality glass is between 20-50, high quality glass (with little dispersion) is above 50 approaching 60-80
It is probably useful: http://refractiveindex.info/?group=GLASSES&material=F\_SILICA
And calculator: http://www.calctool.org/CALC/chem/substance/abbe