I've attempted to add a Fresnel term to the dielectric.

To start, I rendered a sphere with an index of refraction of 1.00, no Fresnel term, no reflections:

Here's another sphere, no reflections, index of refraction 1.33:

Now with a Fresnel term, index of refraction 1.00:

Also with a Fresnel term, index of refraction 1.33:

Those last two images don't look quite right. The reflections are way too strong and are pretty blown out.

I believe that I'm using the equations at http://en.wikipedia.org/wiki/Fresnel_equations to add the Fresnel term.

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I suspect the reflection term is greater than 1. Will clamping it help? A quick render seems to indicate that it might.

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