| http://www.w3.org/ns/prov#value | - With respect to the above problems, there is a method that is envisioned for preventing the occurrence of a shift in the center position of light incidence while adjusting the assembly angles of the dichroic mirrors 50R, 50G, and 50B. FIG. 4 shows a method of adjusting the angle of incidence of the illuminated light flux without changing the center position of incidence of the illuminated light fl
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