A loop of wire is dipped in soapy water and held up so
Chapter , Problem 6(choose chapter or problem)
A loop of wire is dipped in soapy water and held up so that the soap film is vertical. (a) Viewed by reflection using white SSM 270, 90, 180, light, the top of the film appears black. Explain why. (b) Below the black region are colored bands. Is the first band red or violet?
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