We have developed films of pure polymethylmethacrylate (PMMA) (0.5, 1, 2 and 5%) and potassium permanganate (KMnO4)\documentclass[12pt]{minimal}
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\begin{document}$$(\hbox {KMnO}_{4})$$\end{document}-doped PMMA composite films of thickness (∼100μm\documentclass[12pt]{minimal}
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\begin{document}$$\sim 100\, \upmu \hbox {m}$$\end{document}) using the solution-cast technique. To identify the possible change that happen to the PMMA films due to doping, the optical properties were investigated for different concentrations of KMnO4\documentclass[12pt]{minimal}
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\begin{document}$$\hbox {KMnO}_{4}$$\end{document} by recording the absorbance (A) and transmittance (T%\documentclass[12pt]{minimal}
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\begin{document}$$T\%$$\end{document}) spectra of these films using UV–Vis spectrophotometer in the wavelength range of 300–1100 nm. From the data obtained from the optical parameters viz. absorption coefficient (α\documentclass[12pt]{minimal}
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\begin{document}$$\alpha $$\end{document}), extinction coefficient (κ\documentclass[12pt]{minimal}
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\begin{document}$$\kappa $$\end{document}), finesse coefficient (F), refractive index (η\documentclass[12pt]{minimal}
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\begin{document}$$\eta $$\end{document}), real and imaginary parts of dielectric constant (εr\documentclass[12pt]{minimal}
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\begin{document}$$\varepsilon _{\mathrm{r}}$$\end{document} and εi)\documentclass[12pt]{minimal}
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\begin{document}$$\varepsilon _{\mathrm{i}})$$\end{document} and optical conductivity (σ\documentclass[12pt]{minimal}
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\begin{document}$$\sigma $$\end{document}) were calculated for the prepared films. The indirect optical band gap for the pure and the doped-PMMA films were also estimated.
