| 摘要 |
There is disclosed an illumination optical apparatus which illuminates a surface to be illuminated on the basis of light from a light source, comprising, a first polarizing member arranged as rotatable around an optical axis of the illumination optical apparatus or around an axis substantially parallel to the optical axis; and a second polarizing member arranged as rotatable around the optical axis or around said axis substantially parallel thereto in an optical path between the first polarizing member and the surface to be illuminated, wherein each of the first polarizing member and the second polarizing member provides incident light with variations in a polarization state different according to respective positions of incidence.
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