A method for determining bandgap energy using diffuse reflection is presented. The method uses bifurcated fiber optic cables to measure the diffuse reflection of diffusely reflective materials. The absorption spectrum is extrapolated from the diffuse reflection spectrum and used to determine the bandgap of powdered materials. The theory of nonspecular reflection, the Kubelka-Munk model, and bandgap structure is explored. The methods, procedure, and equipment involved in measurements are detailed. The bandgap energies of titanium dioxide, tin sulfide, and 10 percent tin doped indium oxide are determined. The measured bandgap energy of TiO₂ agrees within 0.03 eV of the accepted value. The measured bandgap energy of SnS was inconsistent with the accepted value and is most likely attributable to incorrect infrared spectral data. The measured bandgap energy of In₂₋[subscript]xSn[subscript]xO₃ agrees within 0.1 eV of the accepted value.
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