Thin Films: A light beam with wavelength 500 nm is reflected constructively from a thin layer of oil having index of refraction 1.25. The oil floats on the top of water of index of refraction 1.33. What is the minimum thickness of the layer of oil?
A. 100 nm
B. 150 nm
C. 175 nm
D. 200 nm
E. 225 nm
Answer: D
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