Two fiber tips and lens twice are employed in this kind of device.
提出了一种双通道式多功能光环形器,在结构设计中插入了双尾纤及透镜对,实现了器件功能复用,降低了制造成本与占空比。
The principal points of a thin lens coincide at the center of the lens.
薄透镜的两个主点与透镜中心相重合。
lens center thickness gauge
透镜中心厚度测量规
a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted.
穿过曲面透镜中心的光线不会反射和折射的线。
Study on Measurement System of Centering Errors Based on Digital Image Processing;
基于图像的透镜中心误差测量系统的研究
Design and Study on Measurement System of Centering Errors Based on Digital Image;
透镜中心误差影像法测量系统的设计研究
Minimum thicknesses in rim and centre of lens
GB/T1205-1975透镜边缘及中心最小厚度
Some are flared-that is, thicker at the rim than in the center, like a concave lens.
有些呈喇叭形──即边缘较中心厚，类似凹透镜。
A line through the optical center of a lens that is perpendicular to both its surfaces.
光轴通过透镜的中心垂直于物体两面的线
Study on Visual Recognition System with Fovea Lens
具有中心窝透镜组的视觉识别系统研究
The lens or lens group closest to the eye in an optical instrument;an ocular.
目镜光学仪器中靠近眼睛的透镜或透镜组；窥孔
A single lens in a pair of glasses; a monocle.
单片眼镜一对眼镜片中的一个单透镜；单片眼镜
Some of these telescopes have glass lenses in them.
其中一些望远镜里安装着玻璃透镜。
The curvature of the film is concentric with the mirror behind the meniscus.
胶片的曲率是和弯月透镜后面的反射镜同心的。
a concave lens [mirror]
凹透镜 [凹面镜]
meniscus (shaped) lens
凹凸透镜，弯月形透镜
aplanat [aplanatic] lens
消球差透镜，齐明透镜
The side of a lens is curved. The middle part of some lenses is thicker than the edge. In other lenses, the edge is thicker than the middle part.
透镜的面是曲线型的，有些透镜的中间比边缘厚，有一些透镜的边缘比中间厚。
Explanation: The center of our Milky Way Galaxy is hidden from the prying eyes of optical telescopes by clouds of obscuring dust and gas.
说明:在不透光尘埃与云气的遮掩下，我们银河系的中心在普通可见光望远镜中是难以看见的。