real birds?

Subject: real birds?
From: (John Leonard)
Date: Wed, 6 Nov 1996 15:06:34 +1100 (EST)
>When you look through a pair of binoculars or through a telescope at a bird
>, what you actually see is a magnified VIRTUAL image, not a REAL image of 
>the bird. Therefore you don't really SEE the bird through your optics. 
>Whilst for the vast majority of birds this doesn't matter too much as 
>normally you see them with your naked eye, although they are identified 
>using binoculars, it does pose some serious problems about ticking birds 
>only seen through your telescope on seawatches etc.
 I wear glasses, so ALL the birds I see are not real images but virtual
ones. Do I have to take my glasses off and squint at the blur before I can
tick the species I identified with binocs?


Dr John Leonard
PO Box 243, Woden,

"a major part of the work of praeter-modernity
will be the refabrication of authenticites."


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