This is like the question "Why is water liquid, and not gas, on Earth ?"
I think the molecular properties that make a substance opaque or
transparent may be better understood by looking at the way liquid
crystal shutters and displays work. By applying an electrical charge to
an otherwise opaque panel we can reorganize the structure and make it
transmit light.
Herschel
lookaround360@xxxxxxxxxxxxxxxxx wrote:
Guys,
Why does an image of a chicken pass through glass?
Not to get to the other side!
Real good answer here:
http://answers.yahoo.com/question/index?qid=20081113042053AAS9p2i
I used WickiAnswers and got:
"Because glass is transparent which means light can travel through it.
Also because glass is clear. Thats another science question answered by
the Wizzo."
No, that's not from "Ask Dr. Science"!
AZ
Build a 120/35mm Lookaround!
The Lookaround Book.
Now an E-book.
http://www.panoramacamera.us
-------- Original Message --------
Subject: [SPAM] Re: Why does light pass through a lens?
From: Guy Glorieux <guy.glorieux@xxxxxxxxx>
Date: Thu, January 01, 2009 12:09 pm
To: List for Photo/Imaging Educators - Professionals - Students
<photoforum@xxxxxxxxxxxxxxxxxx>
Ahah! So what kind of an image would you get if you drilled a pinhole in
the center of a glass lens?
Greg
Oooops! A pinholed lens?
I've tried to find funny answer but I just couldn't. So here are some
thoughts.
1. You'd get an image with a tiny white imageless hole in the center. This
is because the thickness of the glass lens would prevent a pinhole image to
actually form. The reason we use extremely thin brass shim in which to drill
the pinhole is to ensure that the vignetting arising from the thickness of
the shim is reduced to a minimum.
2. If you could design an extremely thin glass lens and drilled a pinhole
in the center, then you would have two images that should normally perfectly
overlap since the lens focal length would be identical to the focal length
of the pinhole. However, since each lens will have their own distortion
features, the pinhole and the lens will not produce identically configured
images.
3. Evidently, the pinhole image would be washed out completely by the lens
image since the effective aperture of the pinhole would be far less than
that of the lens.
Some have reversed the question: what if you put a lens in from (back) of a
pinhole? I'll let you figure that one out, if you can... -:)
Happy New Year!
Guy
