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Originally Posted by Roa_Aoife
. This being the case, I could believe that Nazgul see in UV, but not in Infrared. The wavelengths are far too different and on opposite sides of the visible spectrum. It wouldn't make sense that they could pick up light of such widely different wavelengths, but not the wavelengths in between.
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Ah, but Ms. Roa (or is it Ms. Aoife?
) you are wrong. We indeed have cones in our eyes that "absorb" certain specific wavelenghts. Another thing that absorbs specific wavelenghts is the pigment Chlorophyll in plants. If we see the absorption spectra of this pigment, it absorbs well in both ends of the visible light spectrum, but there is a clear dip in the middle. This light reflected comes out as green, which is why plants are green.
And do you know what else is green? the unhealthy green light that Minas Morghul emanates. What is present in Minas Morghul in a higher concentration than anything else?
Nazghul.
Therefore, what can this green sheen be correlated to? Again, the presence of a Nazghul. So Nazghul somehow emit a green light... furthermore, the light wavelenghts of visible light fall right in between UV and IR lenghts.
Therefore I postulate that Nazghul had cones in their eyes that had evolved somehow from Chlorophyll, although this "dip" in the middle of the absorbance was expanded to almost all of the visible light spectrum (thus they only see "light" as shadows in another context) while they see
both UV and IR. A side-effect of this is that they also glow with a green colour.
Now, if you are still sticking with me here, when Gandalf talks about the Nazghul seeing Glorfindel he says that they saw him "as he is in the other side". This "other side" therefore can only be seen through UV or IR radiation.
Furthermore, we all know elves are "hot" (if not, ask any Movie-Legolas fans) thus there is conclusive evidence that whatever this "other side is" elves emit IR radiation in it, also known as heat.
This confirms beyond any reasonable doubt the theory proposed by our very own
Celuien, the elves indeed melted the snow, let it re-freeze and then walked on ice.