[pure-silver] Re: Optical question
- From: Vick Ko <vick.ko@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 29 Feb 2008 20:05:51 -0500
No difference if before the lens.
If after the lens, I think the image is formed closer to the lens by
1/3rd the thickness of the acrylic, depending on the refractive index of
the acrylic, if my optics memory serves me (and that was a long time ago).
...Vick
Peter De Smidt wrote:
Suppose one were to put a piece of 5mm thick acrylic between a
negative and an enlarging lens. Would the piece of acrylic cause the
distance needed to focus the negative at a given size to change? If
so, would there need to be more or less extension between the negative
and the lens?
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