A thin film of oil, of index of refraction, n =1.25, covers a glass surface. Normally incident light passes through air (index of refraction nair =1.000) and then passes through the oil and the refracted ray exits through the glass which has an index of refraction of n, =1.55 .When illuminated with normally incident light, successive maxima in reflection are observed at wavelengths of 2, = 540.0nm and 2, = 405.0nm (these are air wavelengths). No maxima are observed between those two wavelengths. What is the thickness of the oil film?

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9.
A thin film of oil, of index of refraction, n =1.25, covers a glass surface. Normally
incident light passes through air (index of refraction nir =1.000) and then passes through
the oil and the refracted ray exits through the glass which has an index of refraction of
n, =1.55 .when illuminated with normally incident light, successive maxima in reflection
are observed at wavelengths of 2, = 540.0nm and 2, = 405.0nm (these are air
wavelengths). No maxima are observed between those two wavelengths. What is the
thickness of the oil film?
Transcribed Image Text:9. A thin film of oil, of index of refraction, n =1.25, covers a glass surface. Normally incident light passes through air (index of refraction nir =1.000) and then passes through the oil and the refracted ray exits through the glass which has an index of refraction of n, =1.55 .when illuminated with normally incident light, successive maxima in reflection are observed at wavelengths of 2, = 540.0nm and 2, = 405.0nm (these are air wavelengths). No maxima are observed between those two wavelengths. What is the thickness of the oil film?
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