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.

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。

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Once unleashed, the power channels through a positively charged continuous energy lens at the center of the handle.

一旦被释放，能量会通过剑柄中部带正电荷的能量透镜。

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We present a novel confocal laser method (CLM) for precise testing of the dioptric power of both positive and negative intraocular lens (IOL) implants.

提出了一种新的共焦激光方法，可以精确测量正度数与负度数人工晶状体植入物的屈光度。

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I lay awake nights, wishing to find the perfect lens an instrument of great magnifying power.

VOA: special.2009.07.18

I lay awake nights,wishing to find the perfect lens - an instrument of great magnifying power.

VOA: special.2011.06.18

The power of the lens can be altered progressively by flooding these compartments one at a time.

ECONOMIST: Cataracts

Combining the flexibility and creativity of an interchangeable lens camera with the power of the Android 4.1 platform, the Polaroid iM1836 camera makes it easy for photographers of any skill level to point, shoot, share and tag great photos instantly and effortlessly.

ENGADGET: Polaroid confirms iM1836 mirrorless with Android, adds three more cameras

The power of a large and heavy size super-telephoto lens is available on the compact body of the SP-720UZ, fitting in the palm of your hand, and making it the perfect companion for keeping baggage light on a trip.

ENGADGET: Olympus introduces Stylus SP-820UZ, SP-720UZ cameras and SZ-14 binocular bundle