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?

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?