IOR?

[Anonymous]

Hello everyone.

It's question not for 3ds's users only, for ever who is strong for the theory of light and property of materials.

Recently i had some experiment with material for Fresnel's effect and noticed strange thing for me. I know when i increase IOR, the Fresnel effect become more appreciable. But if i set IOR more than 10-20 the object has become specular. What?? 

I read some about light and Fresnel effect, but found no word about how IOR (Index of REFRACTION!!) influences on REFLECTION. Look at..

I know principle of Fresnel effect up to IOR= 2,2, but after...

Someone, please, explain to me this physic phenomenon.

Thanks all! (sorry for my English:))