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Effect of cold plasma on the form of rays propagating in the equatorial planeof a rotating black hole is investigated. Two kinds of regions in theradius-impact parameter plane allowed for the rays are constructed: forradiation with a given frequency at infinity and for radiation with a given``telescope frequency'' seen by a local observer. The form of allowed regionsfor locally nonrotating observers as well as observers falling freely frominfinity is established. The allowed regions contain rays which directly reachthe horizon, or there exists a ``neck'' connecting the forbidden regions suchthat the rays coming from infinity cannot reach the horizon. In case weconsidered a set of observers at various radii instead of the neck we find twodifferent regions -- from one the rays reach the horizon and not infinity andfrom the other one they reach infinity, but not the horizon. The results areanalyzed by analytical methods and illustrated by figures constructednumerically.

Radiation in the black hole - plasma system: propagation in equatorial plane