Multilayer-film reflective mirrors are disclosed. An exemplary such mirror has a base and a multilayer film formed on the base. The multilayer film includes multiple layer pairs. Each layer pair includes a respective first layer and a respective second layer, wherein the first and second layers are laminated together in an alternating manner. The multilayer film has first and second regions that reflect extreme ultraviolet light. A first group of layers is disposed in the first and second regions and has a first periodic length. A second group disposed in the first region has a second periodic length different from the first periodic length, and a third group disposed in the second region has a substantially same periodic length as the first periodic length.