| 摘要 |
Optical apparatus for determining the angle at which light is reflected by a surface being scanned by light spot, wherein in the area of the light beams emanating from the surface is provided a lamellar stepped mirror arrangement which extends in the scanning direction and whose individual planar mirrors are arranged parallel to one another and deflect the light which strikes them to an optical system on whose focal plane is arranged a photo detector array extending at right angles to the optical axis.
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