  We investigate correlations between the direction of the optical linear
polarization and the orientation of the host galaxy/extended emission for type1
and type2 radio-loud and radio-quiet quasars. We have used high resolution
Hubble Space Telescope data and a deconvolution process to obtain a good
determination of the host galaxy/extended emission (EE) position angle. With
these new measurements and a compilation of data from the literature, we find a
significant correlation, different for type1 and type2 objects, between the
linear polarization position angle and the orientation of the EE, suggesting
scattering by an extended UV/blue region in both types of objects. Our
observations support the extension of the Unification Model to the higher
luminosity AGNs like the quasars, assuming a two component scattering model.
