In this paper the aberrations of a sort of sphere lens with spherical Symmetrical gradient index have ben analysied.
本文分析了一种折射率为球对称梯度分布的球形透镜的像差，得到了该透镜对无限远物点的纵、横向球基及其焦距的精确表达式。
The annular lens dark field vertical illumination system has been more and more applied in special microscopes.
环形透镜暗场落射照明系统越来越多被应用在特型显微镜上。
meniscus (shaped) lens
凹凸透镜，弯月形透镜
meniscus astrograph
弯月形透镜天体摄影仪
meniscus photoheliograph
弯月形透镜太阳摄影仪
Shaped like a biconvex lens.
双凸透镜状的形状像双凸透镜的
aberration of the concave mirror is reduced by a meniscus lens.
用半月板镜头减少凹透镜的过失。
gas permeable lens
ph.1. 透气隐形眼镜
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。
wagon-box rivet head
扁头形[透镜形]大直径铆钉头
A lens is a round piece of glass, but it is not flat.
透镜是一个圆形玻璃片，但不是平的。
These sandstone bodies form elongate lenses.
这些砂岩体形成伸长的透镜体。
Measurement of optical surface and foci of long focal length lens by CGH
计算全息法测量长焦透镜面形和焦距
Guarantee Measure of Symmetry Degree when Processing the Square Lens Parts
加工方形透镜零件时对称度保证措施
compound lens or lens system designed to be free of astigmatism and able to form approximately point images.
没有散光并且能够形成近似的图像的透镜或透镜系统。
Incorporating HIGH DEFINITION OPTICS?( HDO?) technology, lens geometry comes in five interchangeable lens shapes.
合并的高定义OPTICS?(DO?技术,透镜几何进来五互换性的透镜形状。
The lens or lens system in a microscope or other optical instrument that first receives light rays from the object and forms the image.
物镜首先从物体上接收光线并形成影像的显微镜或其它光学仪器中的透镜或透镜系统
Objective: An objective is a system of one or more pieces of lenses grouped together. It refracts light and can form an image. Alternatively known as Lens.
镜头:镜头是一片或多片透镜的组合。它折射光线而形成影像。
a concave lens [mirror]
凹透镜 [凹面镜]
The Reflection of the Self-image--To Analyze the Images of Others in Jinghuayuan;
自我形象的映照——《镜花缘》中的“他者”形象透视