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We present the results of photometric (V band) and polarimetric observationsof the blazar BL Lac during 2008--2010 using TRISPEC attached to the KANATA1.5-m telescope in Japan. The data reveal a great deal of variability rangingfrom days to months with detection of strong variations in fractionalpolarization. The V band flux strongly anti-correlates with the degree ofpolarization during the first of two observing seasons but not during thesecond. The direction of the electric vector, however, remained roughlyconstant during all our observations. These results are consistent with a modelwith at least two emission regions being present, with the more variablecomponent having a polarization direction nearly perpendicular to that of therelatively quiescent region so that a rising flux can produce a decline indegree of polarization. We also computed models involving helical jetstructures and single transverse shocks in jets and show that they might alsobe able to agree with the anti-correlations between flux and fractionalpolarization.

Anti-correlated Optical Flux and Polarization Variability in BL Lac