With the idea of the beaming models, we derive a relation between the obser
ved polarization and Doppler-corrected magnitude; that is, the observed pol
arization is in anti-correlation with the Doppler-corrected magnitude. Maki
ng use of the infrared data observed simultaneously by Impey et al. [Mon. N
ot. R. Astron. Sec. 200 (1982) 19; 209 (1984) 245] and Holmes et al. [ibid.
210 (1984) 961] we found that: (1) there is a significant correlation betw
een the observed maximum polarization and Doppler-corrected magnitude but t
he polarization is not in anti-correlation with the Doppler-corrected magni
tude; (2) the maximum infrared polarization is strongly correlated with the
maximum optical polarization Our conclusion is that the infrared polarizat
ion depends only on the degree of ordering of the magnetic held in the sync
hrotron emission regions and not on the beaming effect. Both infrared and o
ptical emissions originate from the synchrotron radiation.