Lithographic apparatus

摘要

A lithographic projection apparatus comprises an active reflector (30) in a radiation system providing a projection beam of radiation and/or in a projection system. The active reflector comprising a body member (33), a reflective multilayer (13) and at least one actuator (31,32) controllable to adjust the surface figure of the reflecting multilayer, wherein the actuator exerts a substantial force component (fr) in a direction parallel to the surface figure of said reflective multilayer. The actuator may be operative to apply torques to said reflector. <IMAGE>