RE: Re: New HIE Problem (Lines) and Re: (fwd) Re: Isn't IR LED a n oxymoron?

["Mr D.A. Munindradasa" <D.A.Munindradasa@xxxxxxxxxxxxxxx>]

>So it shouldn't really pose so much of a quandry that some L.E.D. (Iight
>emitting diodes) emit IR. By the way, fhe first LASER (Light Amplification
>by the Stimulated Emission of Radiation) emitted infrared light! 

It was not real infrared instead just microwave radiation hence was
labelled a MASER, though the possibility of LASER was predicted
theoretically well before that. Indeed first true LASER was ruby. The
spectral emission was in 'red'. 
 
>If you wish further confusion (and who doesn't?) consider this: pure
>ultraviolet light isn't visible to us, either! But it is visible to
>honeybees, butterflies, and other insects.

IR too is visible to some reptiles, specially vipers (hump-nosed-viper
and green-pit-viper for example).

Surely IR and UV are not in 'visual' range of spectrum. Does that mean
'light' is a bit fussy term?

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