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