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Re: Double concave mirror toy



Hi,

Consider the simpler system consisting of an
object such as a penny and a lens set to form a
real inverted image. If one shines a laser on
the image AND shines it from within the "viewing
cone" of the image, the laser light will pass
through the image be bent by the lens and
illuminate the penny. The spot illuminate on the
penny is the spot associate with the spot on the
image through which the laser light passed. The
light from the illuminated penny now helps form
the image.
If the laser is outside the viewing cone the light
will miss the lens.
In the case of the floating coin demo, the
"viewing cone" is much larger and carefully tuned
to make the floating coin more convincing.


Thanks
Roger

"Greenberg, Jon" wrote:

Scott, the IMAGE reflects the laser? How can that be?

----------
From: Scott Goelzer
Reply To: phys-l@lists.nau.edu: Forum for Physics Educators
Sent: Tuesday, May 7, 2002 1:23 PM
To: PHYS-L@lists.nau.edu
Subject: Re: Double concave mirror toy

Just did this! How cool. Took most everyone in the department by surprise.

Thanks
Scott

*****************************
S.Goelzer
Physics Teacher
Coe - Brown Northwood Academy
Northwood NH 03261
603-942-5531 ext43
sgoelzer@coebrownacademy.com
*****************************



on 5/7/02 9:20 AM, Tom Bross at Tbross@AOL.COM wrote:

Try shining a laser pointer on the real image. Ask students why
something
you can't touch seems to reflect light.

Tom Bross




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