Mount a clear filament light bulb (mine has a
c-shape filament when looking down from the top)
to the bottom of a cardboard box. I have a lamp
socket that I use that has the cord coming out the
socket with a push-on push-off switch on the
outside. I then cover the other side of the box
with aluminum foil. In addition, I mounted a nut
to one side of the box so that I can hold it up
with a tripod.
With the light on and the foil side pointed toward
the chalk board, take a pin and punch on hole at a
time in the foil.
At he end I punch a hole in with my finger. I can
take a picture of mine and published it to my web
site if you wish.
Dick
Helping teachers who facilitate, motivating
students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg
Hts, OH 44130 440-826-0834
www.cvcaroyals.org/~rheckathorn/
Adjunct Physics Teacher - Baldwin Wallace College
Physics is learning how to communicate with ones
environment so that it will talk back.
-----Original Message-----
From: tap-l-owner@lists.ncsu.edu
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of
Anthony Lapinski
Sent: Thursday, April 12, 2007 1:27 PM
To: tap-l@lists.ncsu.edu; tap-l@lists.ncsu.edu;
phys-l@carnot.physics.buffalo.edu
Subject: [tap-l] pinhole camera
When I teach optics in my (high school) course, I
traditionally discuss
reflection leading into plane and curved mirrors,
then refraction leading
into lenses. Does anyone incorporate pinhole
cameras when they teach this
topic? It has been in the back of my mind for
years, but there is
little/no math involved and "higher level"
textbooks rarely mention them.
I am thinking it would be a good way to show
students that light travels
in straight lines, and to introduce them to real
images (rather than begin
with virtual images in a plane mirror).
Does anyone have a class activity/demo/lab (or a
useful web site) they
could share so I can get some ideas about how to
introduce/use this simple
device (e.g., made with paper towel roll and foil)
and have student begin
to understand how images are formed? A lab
activity with questions is what
I'm looking for. Thanks!