In the Snack, Touch the Spring, there is a black box, but no black
mirror. The main thing in these Snacks is the reflection of light,
and which direction the reflections go thus creating the images.
To get a 16 inch (40 cm) diameter concave mirror you should check web
sites for scientific supply houses. Here are some that are listed on
the snack supplies page
(http://www.exploratorium.edu/snacks/snacksupplies.html):
http://www.edsci.com/
http://www.fisheredu.com/
http://www.sciplus.com/
http://www.arborsci.com/
You could also just do a web search for "concave mirrors" and you
would probably find some other possibilities.
Nina Thayer
Snacktalk Moderator
> > snacktalk@exploratorium.edu >
> I've seen the discussion about parabolas, but i didn't understand very well
> what efect does the black mirror make, does it form a 3D image of a given
> shape, i mean does it form like a sort of an holographic 3d image.
> Is there other ways to make an holographic effect (touch the spring)
>
> where can i buy A 16 inch (40 cm) diameter concave mirror A 16 inch (40 cm) diameter
> concave mirror on the internet, because i live outside USA
>
> --
>
> _______________________________________________
> Sign-up for your own FREE Personalized E-mail at Mail.com
> http://www.mail.com/?sr=signup
>
>
> 1 cent a minute calls anywhere in the U.S.!
>
> http://www.getpennytalk.com/cgi-bin/adforward.cgi?p_key=RG9853KJ&url=http://www.getpennytalk.com
>
>
>
This archive was generated by hypermail 2.1.3 : Mon Apr 24 2006 - 11:34:49 PDT