| 摘要 |
<p>The last lens element but one (r11, 12, 13) is a thick meniscus concave towards the image and the last lens (r14, 15) is a plane-concave Smith lens plane towards the image. The group of convergent lenses is made up of three convergent lenses (r1-r6). The thick meniscus (r11-r13) is a convergent lens and has a scattering cemented face concave towards the object. The biconcave lens (r7, r8) has its more strongly curved refracting face turned towards the image. This more strongly curved face is curved at least 10% more than the face on the object side of the following biconvex lens (r9, r10).</p> |
