Quote:
Originally Posted by Phil G4SPZ
Would looking at two ultraviolet sources with a frequency difference in the visible range give rise to a visible effect?
|
On the same sort of principle as hearing 'bat beats', probably not. As I understand it, the human retina is fairly sensitive to (near) UV, but is protected by the filtering effect of the cornea. Apparently, if the cornea is removed, as sometimes happens when there is a necessary delay during cataract surgery, the patient is able to see UV directly. Although I haven't checked, I'd imagine that enough spread-spectrum UV reaches us regularly for any intermodulation effect to be well known should it occur.