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Strange.Hypersmurf said:That was because the drow's ability to see in darkness at the time the novel was written resulted from the ability to see patterns of heat - infravision, not darkvision.
-Hyp.
Since infravision sees heat, and heat is a form of light, a mirror would show a heat image to those with infravision.
After all, aluminum foil is useful not because it reflects visible light, but that it reflects other wavelengths as well......