A Thin Film of Soapy Water (N = 1

question 3

Multiple Choice

A thin film of soapy water (n = 1.37) is held vertical. Light of wavelength 600 nm is reflected from the film and horizontal dark lines appear. What is the thinnest soap film for which a bright band will occur?

• A) 150 nm
• B) 109 nm
• C) 90.0 nm
• D) 438 nm
• E) 219 nm

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