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What can I use instead of a prism?
For my Science in the Elementary class, my group and I are doing the weather for our unit to teach grade schoolers. My lesson will be on rainbows and how light creates one. I found an activity using a mirror, light, and water in a bowl. Because colors and the rainbow aren't part of the activity, I want to include a prism to bounce the mirror's reflection through to try and get the rainbow. The problem is, I don't know where to find one and we start teaching next Tuesday! Is there anything I can use instead of a prism? Or where can I find one (I go to college in a small town - there's a Fred Meyer, Albertson's, Safeway, Ace Hardware, Radio Shack, and an agate and bead store)?
According to the lesson plan in which I found the activity, a rainbow is supposed to appear. But when I tested the experiment, all I got was the usual white reflection in the shape of the mirror. I tested it in my room with my ceiling light instead of sunlight (which the lesson calls for).
http://scientificsonline.com/category.asp?c=424591&sid=google&cm_mmc=google-_-cpc-_-edmu-_-prisms&WT.term=prisms&WT.campaign=58&WT.source=google&WT.medium=cpc&WT.content=36043&cshift_ck=1337236238cs36043&WT.srch=1
You can purchase inexpensive prisms there. There is also an even more inexpensive option, but I don't recall what they are called.
I believe if you use material that is similar to an overhead projector sheet, you get a very similar effect to that of a prism. There are small square sheets that you can find that, when held up to light, display colors of the rainbow.
It looks like this is what you're looking for:
http://scientificsonline.com/product.asp_Q_pn_E_3054509
You can find simpler and more inexpensive options, but you want a sheet that effectively works as a diffraction grating.
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