| http://www.w3.org/ns/prov#value | - Also, the coils 427 may be provided as a single coil, or may encase ferromagnetic iron cores inserted therein. [0190]FIG. 23 shows still another example of the deformable mirror 409 applicable as a variable mirror used in the zoom optical system according to the present invention. [0191] According to this example, the substrate 409 e is made of a ferromagnetic such as iron and the thin film 409 a
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