| 摘要 |
A method for measuring aberration of an optical system that constitutes an interferometer comprises a step of disposing a reflecting member at an image point of the optical system and a step of detecting, by detection means, interference fringes formed based on light that has been emitted from a light source, transmitted through the optical system, caused to illuminate the reflecting member, reflected by the reflecting member and transmitted through the optical system again. The refractive index of the reflecting member with respect to the light is equal to or larger than 1.8.
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