Electric light scattreing technique is applied for studying the electrical and hydrodynamic properties of anisometric particles in strongly diluted suspensions containing polyelectrolytes. Variations in the particle interfacial polarizability, being related to the surface charge density of the colloid-polymer complex and ions mobility along its surface, are followed when oppositely charged polyelectrolyte is adsorbed on a colloid particle. The appearance of an additional low-frequency electro-optical effect near the range of particles rotation is related to polarization of counterions which condense on the polyion surface above a critical threshold of polymer charge. Lower mobility of condensed counterions in comparison to the mobility of free ions in the dispersion medium is supposed as reasonable explanation of this effect. Polarization of free ions from the particle diffuse electric double layer is considered, on the other hand, to be responsible for creation of the high-frequency electro-optical effect in colloid-polyelectrolyte suspension. The role of counterion valency into the low- and high- frequency effect formation is also shown. Similar behavior of stabilized suspension (containing particles which are saturated with polymer) to that of pure polyelectrolyte solution is found and possibilities to use electro-optics of stabilized suspensions for studying electric properties of polyelectrolyte molecules are demonstrated. Electro-optical technique is successfully applied to determine the hydrodynamic thicknesses of the adsorbed polymer layers. They show flat configuration of the adsorbed polyelectrolyte molecules, slightly depending on the polyion charge density. Variations in the suspension stability due to polyelectrolyte adsorption are recorded and its correlation with the electric surface properties of the colloid-polymer complex is discussed in terms of particle charge neutralization.