Fig. 4 shows a system in which light modulated by light modulators 15A and 15B is redirected to form beams 12A and 12B that converge toward image plane 13 at angle α. One or more optical elements may be provided to redirect the light. In the illustrated embodiment the redirection is provided by a prism 30. From the point of view of optical system 17, light modulators 15A and 15B appear to be at locations 15A’ and 15B’ respectively.