A film of oil on water will appear dark when it is very thin, because the path length difference becomes small compared with the wavelength of light and there is a phase shift at the top surface. If it becomes dark when the path length difference is less than one-fourth the wavelength, what is the thickest the oil can be and appear dark at all visible wavelengths? Oil has an index of refraction of 1.36. (Assume the range of visible wavelengths spans from 380 to 760 nm.)
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A film of oil on water will appear dark when it is very thin, because the path length difference bec...
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