| 摘要 |
<p>An optical system for illuminating an object, including an entrance pupil for receiving light from a light source, an exit pupil for passing the light received to an object to be illuminated, and an optical axis which extends through the optical sytem to the light source and the object respectively, wherein the entrance height of the light received in the entrance pupil is substantially proportioned to the tangent of the exit angle in the exit pupil.</p> |
