Thin Films: A sodium light, having wavelength 589.3 nm, is used to view a soap film to make it look black when directed perpendicular to the film. What is the minimum thickness of the soap film if the index of refraction of soap solution is 1.38?
A. 114 nm
B. 194 nm
C. 294 nm
D. 314 nm
E. 214 nm
Answer: E
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