| 摘要 |
<p>An optical apparatus comprising an image-forming arrangement for projecting an image of an illuminated object onto an image plane, the image-forming arrangement having a plurality of magnification modes in which modes the angle of incidence of the image rays onto the image plane changes in dependence upon the mode, and a slit arrangement positioned between the image forming arrangement and the image plane, characterized in that the slit arrangement defines a slit the effective plane of which is inclined to the image plane such that the slit presents a different effective slit width to the image rays in accordance with the angle of incidence of the image rays (and therefore in accordance with said mode), whereby the greater the magnification, the wider the effective slit width.</p> |
