1. The eyepiece of an optical instrument. 
   光学仪器的目镜
2. has two converging lens system; the objective and the eyepiece. 
   有两个会聚镜头系统；物镜和目镜。
3. image is viewed through an eyepiece perpendicular to main axis. 
   通过垂直于主轴的目镜观察物体。
4. large convex lens produces image that is viewed through the eyepiece. 
   通过目镜观察物体图像的大的凸透镜。
5. large concave mirror produces image that is magnified by the eyepiece. 
   由目镜产生放大图像的大的凹透镜。

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