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Lesson Planet
If you are up for constructing a wooden frame, you can do this demonstration of the interference patterns when light reflects off of layers of soapy film. Both constructive and destructive interference can be seen as evidenced by the colors in the beautiful patterns that appear. Assembling the apparatus may seem daunting, but would be worthwhile as you use it year after year with your physics class.
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Pros
- A memorable and eye-catching demonstration
Cons
- None