Resolving optical constants from reflectance of liquids in the UV-visible range

Reflection spectra of liquids were measured in the UV-visible spectral rang e with the use of a recently developed reflectometer, The complex refractiv e index of two solutions, lignin and red food color, both diluted in water, were investigated. For the first time a maximum entropy model was applied in recovering complex reflectivities from non-normal incidence reflectance spectra of liquids. The optical constants in the UV-visible range were then resolved by Fresnel's equations.