1. Apparatus for use with a system which includes a detector array operable to produce a first signal containing information indicative of the characteristics of a remote object and to produce a second signal containing information indicative of the range to the remote object comprising: radiation emitting means operable in a first condition to transmit radiation to the remote object so as to substantially uniformly illuminate the remote object, the remote object reflecting at least a portion of the radiation to the detector array for use thereby in producing the first signal and in a second condition to transmit radiation to the remote object so as to provide a non-uniform pattern of illumination on the remote object, the remote object reflecting at least a portion of the radiation to the detector array for use thereby in producing a second signal.