Kindly provide the required formula and relevant references
Reflectance, absorbance, and transmittance are spectra. You can use a spectrometer to record any of them.
To extract the refractive index spectrum you should use the reflectance and transmittance data in equations 1 and 3 of this paper (it is open access);
Article Effect of Ag-Nanoparticles Doped in Polyvinyl Alcohol on the...
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