Patent ID: 7929113

Claim:
A measurement apparatus configured to illuminate a pattern positioned on an object plane of an optical system to form an image of the pattern on an image plane of the optical system and measure a light intensity distribution of the image via a slit positioned on the image plane, the measurement apparatus comprising: a stage configured to move the slit; a light receiving element which is mounted on the stage and includes at least two light receiving portions which receive light that has been transmitted through the slit; a storage unit configured to store a relationship between an angle between a direction parallel to an interference pattern of the image and a longitudinal direction of the slit and a distance in the longitudinal direction of the slit between a center position of the slit and a position where an intensity of light that the light receiving element receives is maximum; a calculation unit configured to obtain the angle using detection result detected by the light receiving element and the relationship stored in the storage unit; and a stage driving unit configured to rotate the stage so that the angle is equal to zero, using the angle calculated by the calculation unit.