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A film with an index of refraction n= 2.63 floats on top of water (n=1.33). A...

A film with an index of refraction n= 2.63 floats on top of water (n=1.33). A light beam with wavelength 700 nmnm is reflected from the top and the bottom of the film. What are the phase changes from the top and bottom reflection, respectively?

no phase change, 466 nmnm phase change
no phase change, no phase change
350 nmnm  phase change, 466 nmnm phase change
350 nmnm  phase change, no phase change
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