本实验是利用两块空间频率相同的黑白光栅产生的莫尔条纹来测量长焦距透镜的焦距。
In this experiment, we use two gratings with the same frequency to generate Moire fringes and use them to measure the long focus length of lens.
两个焦距都是10厘米的透镜形成的组合透镜焦距为5厘米。
Two lenses of focal length 10 cm have a combined focal length of 5 cm.
用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.
焦距是透镜最重要的光学参数，应用泰伯—莫尔法测量长焦距透镜焦距具有重要的实践价值。
Focal length is the important optical parameter of optical lens. It is valuable that methods based on Talbot effect and Moire technique are applied for measuring the long focal of lens.
该可调整焦距的、可电学控制的电激活透镜能够不连续地或连续地调整焦距。
The adjustable focusing electrically controllable electroactive lens can adjust the focal length discretely or continuously.
该可调整焦距的、可电学控制的电激活透镜能够不连续地或连续地调整焦距。
The adjustable focusing electrically controllable electroactive lens can adjust the focal length discretely or continuously.
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