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Infrared and optical photometric and spectroscopic observations of thesymbiotic nova RR Tel are used to study the effects and properties of dust insymbiotic binaries containing a cool Mira component, as well as showing"obscuration events" of increased absorption, which are typical for such Miras.A set of photometric observations of the symbiotic nova RR Tel in differentwavelength bands - visual from 1949 to 2002 and near-infrared (JHKL) from 1975to 2002 - are presented. The variability due to the normal Mira pulsation wasremoved from the JHKL data, which were then compared with the AAVSO visuallight curve. The changes of the Fe II emission line fluxes during the 1996-2000obscuration episode were studied in the optical spectra taken with theAnglo-Australian telescope.  We discuss the three periods during which the Mira component was heavilyobscured by dust as observed in the different wavelength bands. A change in thecorrelations of J with other infrared magnitudes was observed with the colourbecoming redder after JD2446000. Generally, J-K was comparable, while K-L waslarger than typical values for single Miras. A distance estimate of 2.5 kpc,based on the IR data, is given. A larger flux decrease for the permitted thanfor the forbidden Fe II lines, during the obscuration episode studied, has beenfound. There is no evidence for other correlations with line properties, inparticular with wavelength, which suggests obscuration due to separateoptically thick clouds in the outer layers.Comment: 19 pages, 11 figures, 3 table

The effect of dust obscuration in RR Telescopii on optical and IR long-term photometry and Fe II emission lines