A set of calculating formulae of original constructional parameters for autocollimatic etsting of convex hyperboloid and paraboloid using a meniscus lens is derived from the third order aberration theory.
根据三级像差理论,推导用弯月透镜检验凸双曲面和凸抛物面的初始结构参数计算公式,讨论设计方法,给出设计实
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。
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
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。
A gravitational lens is formed when light is bent by a massive object.
引力透镜现象就是光被巨大质量物体弯曲的现象。
a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication.
与角膜相适合矫正视力或传递药物的薄且弯曲的玻璃或塑料透镜。
The object's gravitational field will bend the starlight like a lens, briefly making the star appear slightly brighter.
它的引力场会像透镜一样弯折光线，使星体暂时变得稍微明亮些。
a concave lens [mirror]
凹透镜 [凹面镜]
aplanat [aplanatic] lens
消球差透镜，齐明透镜
One night my grandson woke up in the middle of the night and saw the crescent moon through his window.
有一个晚上，我的孙子半夜醒来，透过窗户看见了一弯新月。
(2) A lens fault which causes the straught lines in the image to be a curve.It is due to the fact that different area of the lens produce different magnification.
（2）透镜缺点之一。它使直线影像变为弯曲的弧线。这是因为镜片各部分有不同的放大倍率所致。
air-spaced doublet
双不胶透镜; 双分离透镜; 双分透镜; 空气隙双合透镜; 分离式双透镜
A sickle moon was in the sky.
弯弯的月亮正悬在空中。
manual zoom lens
(镜头)手控可变焦距透镜
objective lens of the transmission electron microscope
透射电子显微镜物镜
opticians' lens measurer
眼镜制造者用透镜表
A planoconvex lens used to concentrate light.
凸透镜用来聚光的凸镜