Re: Human perception of infrared

[Dan Cardish <dcardish@xxxxxxxxxxxx>]

At 05:10 PM 23-07-97 -0400, you wrote:
>Thanks very much to everybody who gently put me straight on my query as to
>whether people with exceptional eyesight could possibly perceive Near
>Infrared. Good of you to take the time to supply all that fascinating info.
>
>Can I further demonstrate my ignorance with another one?
>
>The wavelength of red light is around 750nm. I believe this equates to
> 0.75mm. If you were to hold a red object such that it almost touched the
>surface of the eye (say half a millimetre away) you would presumably be able
>to perceive it as being red. Yet the light reflected from the object would
>have travelled less than a full wavelength before striking the eye. What am I
>missing here?
>
750nm=750 millionth of a meter, not 750 thousands of a meter

Dan C.
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