Archived posting to the Leica Users Group, 2003/07/16

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Subject: RE: [Leica] digital glass
From: "Clive Moss" <>
Date: Wed, 16 Jul 2003 18:43:44 -0500

According to

"Absorbing even a single photon of light in a rod is enough to evoke a
regular/reliable photocurrent. In fact, Hecht, Schlar and Perrine
demonstrated in the 40's that human subjects can reliably detect single

I think that is also what Feynman said, but I cannot find the reference --
all my books are still in boxes.

I can also heartily recommend Feynman's "Six Easy Pieces" -- recorded on CD
- -- for a layman's introduction to Physics.
- -- 

> -----Original Message-----
> From: 
> [] On Behalf Of 
> Adam Bridge
> Sent: Wednesday, July 16, 2003 3:54 PM
> To:
> Subject: RE: [Leica] digital glass
> On 2003-07-16 saganicc@MSKCC.ORG (Saganich, 
> Christopher/Medical Physics)
> thoughtfully wrote: 
> There's a wonderful little book by, of all people, Richard 
> Feynman, called "QED"
> that does a very good job of explaining all of this. I 
> remember he points out
> that our eyes need only be an order of magnitude more 
> sensative and we'd not be
> debating it at all because we're that close to being able to 
> image individual
> photons. An amazing thing when you think about it.

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