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Fig. 2. (A) Apparatus used to measure spectral reflectivity and polarisation. F, interference filters; L1, L2, L3, light sources; M, dissecting microscope; P, preparation; PMT, photomultiplier tube; Pol., polarising filters; T, tilting table; W, Perspex wedge. (B) Apparatus used to measure reflectivity (after Denton and Nicol, 1962). Symbols as in A. O, opal glass; M1, M2, dissecting microscopes.





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