A slide lever on the bridge of the eyeglasses pushes the fluid forward or backward to alter the shape of that membrane, changing the focal distance depending on what the user is doing.
在眼镜横梁上的滑动控制杆推动流体向前或向后，以改变那层薄膜的形状，从而根据用户当前的动作来调整焦距。
But only with the right focal distance and correct aperture could we get the true pictures.
只有我们调对了焦距，对准了光圈，才有可能得到真实的图像。
Conjugate method is an accurate, simple and convenient method to measure the focal distance of thin convex lens.
共轭法是一种较为准确和简便的测量薄透镜焦距的方法。
An experimental investigation of the combination of a long focal distance Bragg-Fresnel lens with a bimorph mirror is described.
描述了对长焦距布拉格-菲涅耳透镜与可变曲率半径反射镜组合所做的实验研究。
In measuring the focal distance of lens, the experimental accuracy is often affected by the poor quality in the formation of images.
在测量透镜焦距时，往往由于成像质量差而影响实验的精度。
From the focal distance formula of thin lens, the convergence and divergence nature of each kind of thin lens are discussed in different media.
从薄透镜的焦距公式出发，讨论了各种透镜在不同介质中的会聚与发散性质。
A kind of new way to measure optical system focal distance automatically is proposed, which is based on CCD optical-electrical method and digital image processing method.
提出了一种基于CCD光电法和数字图像处理方法自动测量光学系统焦距的新方法。
One major problem the researchers had to overcome was the fact that the human eye, with its minimum focal distance of several centimetres, cannot resolve objects on a contact lens.
研究人员必须解决的一个重要的问题是，人眼的最小焦距是几厘米，无法分辨出隐形眼镜上显示的物体。
This paper introduces a method for the measurement of stress of thin film. In this method a long focal distance microscope is used and deformation of the thin film on thin glass sheet is observed.
本文介绍一种利用长焦距显微镜观察玻璃薄片由镀膜淀积引起的形变来测量薄膜应力的方法。
The invention discloses a telescopic mechanism for mobile phone lens, which is object to resolve the defect that the prior mobile phone cannot use the lens telescoping to regulate the focal distance.
本发明公开了一种用于手机镜头的伸缩机构，旨在解决现有的手机不能通过镜头的伸缩来调节焦距之缺陷。
The invention discloses a telescopic mechanism for mobile phone lens, which is object to resolve the defect that the prior mobile phone cannot use the lens telescoping to regulate the focal distance.
本发明公开了一种用于手机镜头的伸缩机构，旨在解决现有的手机不能通过镜头的伸缩来调节焦距之缺陷。
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