Date: Fri, 24 Sep 2004 12:32:52 -0600

Author: Jerry DiMarco

Subject: Re: Dispersion/diffraction demo using a slide


For the OHP demo, I cover the glass (with overlap) with a piece of
black posterboard that has a 1/8" slit in the center. To prevent the glass
from overheating, put adhesive feet on the underside. Then hang your
grating from the front of the head.
For the slide projector method, make a slit slide to go in the
projector. You can mount a slit in a slide mount if you have them or just
cut a 2" x 2" piece of cardboard, put a 1/16" - 1/8" slit in it and slide
that in the projector. Place your prism (or grating) right in front of the
lens and focus just as you would for a regular slide...


At 01:11 PM 9/24/2004, you wrote:
>I have seen diffraction demos using overhead projectors to shine a large
>spectrum on a wall. I would like to do that in a darkened room without
>added too much ambient light to the room.
>This is pretty silly, but I havn't been able to get the overhead projector
>and diffraction grating demo to work right. Also I don't know that this
>can be done without lots of ambient light. Can someone help me out.
>Also is there a better way to do this with a slide projector?
From Fri Sep 24 15:12:40 2004