A Soap Film Made with Material of Index of Refraction $\lambda$

question 21

Multiple Choice

A soap film made with material of index of refraction n = 1.9 is illuminated by white light.If the reflected light is maximum at $\lambda$ = 350 nm,what is the minimum thickness the film could have had?

• A)175 nm
• B)200 nm
• C)350 nm
• D)46 nm
• E)420 nm

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Unrealistic Optimism

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