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汉语拼音：fàng dà shuài

表示实物经光学仪器所成的像的放大倍数。是一纯数。单个透镜成像时，像长与物长之比叫做线放大率”，也等于像距u与物距v之比，即k=uv。像对眼睛所张视角与直接用眼观察物体时的视角之比叫做角放大率”。把凸透镜用作放大镜时，角放大率m等于明视距离25厘米与凸透镜焦距f之比，即m=25f。显微镜的视角放大率等于物镜线放大率和目镜角放大率的乘积。

功率放大器 [gōng lǜ fàng dà qì]

• Work at 300 to 400% magnification, but switch frequently back to overall view, to see how the finished image starts to look like.

  以300%-400%的放大率来处理，但是要频繁切换到全景图，以查看效果图。

• The longer the focal length of the telescope, generally the more power it has, the larger the image and the smaller the field of view.

  一般来说，望远镜的焦距越长，它的放大率就越大，成像的尺寸就越大，但是视场范围就越小。

• The higher powers are mainly used for lunar, planetary, and binary star observations.

  更高的放大率通常用于月亮，行星和双子星的观察。

• The definition and sharpness of the images depends on the light density of the surroundings and on the magnification.

  象的分辨力和清晰度取决于周围背景的光密度和放大率。

• Objective To determine digital X-rays radiography inherent magnification and calibrate the measuring tools in the machine.

  目的旨在测量数字X线机的固有放大率，并对机器自带测量工具所测的放大率进行校准。

• Since eyepieces are interchangeable, a telescope can be used at a variety of powers for different applications.

  由于目镜是可更换的，望远镜根据需要可以有不同的放大率。

• Selection of angle magnification for a thermal imaging system (TIS) based on the theory of human vision is investigated.

  根据眼脑视觉理论，研究了热成像系统角放大率。

• In the lithographic UCR main advantages is the rate you can reduce the dot gain, reducing wet to overprint.

  在平印洋UCR的次给劣势是可以贬低网不面放大率，裁减干叠印。

• Extended objects will always appear brighter at lower magnifications.

  在低放大率的情况下，扩展光源往往显得更亮一些。