Physics, 04.12.2019 03:31, aaliyahlopez85

78. 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 1.40.

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78. a film of oil on water will appear dark when it is very thin, because the path length difference...