48. A soap bubble appears green (wavelength:540 nm) at the point on its front surface nearest the viewer. What is the smallest thickness the soap bubble film could have? Assume that the index of refraction of the soap film is n=1.35.
(A) 100 nm
(B) 150 nm
(C) 200 nm
(D) 250 nm
(E) 300 nm
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