| http://www.w3.org/ns/prov#value | - A person who implements the invention may suitably provide an optical system, such as an optical lens, a film having a polarizing function, a film for adjusting the phase difference or an IR film in the optical paths indicated by arrows in FIG. 15C. [0169]FIG. 15D is a view illustrating a structure of the light source optical system 1507 in FIG. 15C. In this Embodiment, the light source optical sy
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