APFIVE Phase Change Upon Reflection
A light ray traveling in air (n = 1.00) is incident on a thin film of oil (n = 1.45) floating on water (n = 1.33). At which interfaces will the reflected ray undergo a phase change of 180°?
A
Oil-water interface only
B
Neither interface
C
Both air-oil and oil-water interfaces
D
Air-oil interface only
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