An optical arrangement for illuminating a region within a space comprises a reflector array and lens array having adjustable relative displacement. Each lens of the lens array is arranged to receive light from a first location within the space and to direct it onto one of the reflectors of the reflector array. Each lens is further configured to receive light reflected back from the reflector array and redirect it toward a second location within the space. By adjusting the relative displacement between the two arrays, the position of the second location can be configured.