Re: Mirage optical illusion?
- From: wadexkelman@xxxxxxxxxxx
- Date: Sun, 25 May 2008 17:55:56 -0700 (PDT)
On May 25, 5:32 pm, AES <sieg...@xxxxxxxxxxxx> wrote:
Two identical shallow spherical bowls or saucers, about the size and
shape of a headlight reflector, depth about 1/6 of diameter, polished
mirrored on the interior; one has a central hole about 1/4 the OD of the
dish in the middle of the bottom.
Put the one with the hole upside down on top of the other, facing each
other, rims in contact; put a small object in the center of the bottom
bowl. You see two virtual images of the object, one just outside
(above) the plane of the hole in the upper bowl, the other just inside
that plane.
What's the usual _name_ of this setup, or this illusion? (which is sold
commercially -- at a pricey price! -- under trade name "Mirage" by
Optigone, Inc.)
I don't know that this arrangement has a particular name. (I have
one of these devices, though, and it is very interesting. Kids love
it.)
The two mirrors are actually parabolic. The object placed in the
center of the bottom mirror is at the focus of the upper parabola.
Its light is collimated and directed at the lower mirror, which then
forms a real image (Phil was right!) at its focus at the opening on
the top mirror.
Its operation is described on the following page:
http://www.optigone.com/3D_hologram.htm
Additional images, seen further off-axis, are due to multiple
bounces. They're not as well imaged, though.
Wade Kelman
.
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