Proceedings PaperIs The First Purple At A = 565 nm?
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The uniform field version of the variable wavelength interferometry for transmitted light and a double refracting microinterferometer with Wollaston prism were used for the verification of the Michel-Levy's scale of interference colours of polarized white light emitted by a tungsten halogen lamp (12V/100W). It was stated that the first purple occurs between crossed polars when the optical path difference Δ= 555 to 558 nm, while Δ= 565 nn corresponds to the violet colour near the indigo. Consequently, the other purple colours were observed for the optical path differences slightly smaller than the values of Δ given in the Michel-Levy's scale for both crossed and parallel polars.