Diolma, I suspect you're thinking about the refractive index, rather than the refraction value. The refractive index does indeed govern how much direction change is experienced by light as it passes through the surface and doesn't enter into the equation I gave above. The refrative value on the other hand, measures the proportion of the overall light striking a surface that manages to pass through the surface in order to be refracted. This has everything to do with reflection under all circumnstances, in that any light which doesn't pass through the surface and become refracted, winds up either being absorbed or being reflected (either diffusely, which is the diffuse value, or coherently, which the reflection value). So I stand by my statement: Reflection Value + Refraction Value + Diffuse value < (or =) 1 This is why, when you look at an ordinary piece of window glass, you can both see your own reflection and be seen (refracted) by a person on the other side of the glass. Some of the light that comes off you and goes toward the window gets reflected back to you and some gets refracted through to be seen by a person on the other side. A very small amount is absorbed by the glass and then radiated as heat. If it's still not clear, let me know and I'll try and put together a diagram.

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