focal power的用法和樣例：
例句
- Determine the focal length of your lens.
決定你鏡頭的焦距。 - As a result, the focal lengths in these planes will be different.
結果，這兩個平面內的焦距將不同。 - The lensometer is the instrument of choice for evaluating optical power.
焦度計是用於測定透鏡頂焦度的儀器。 - An athermal space system can be designed by a way of abberation correction upon condition of fixed power of the components.
再在保持光焦度不變條件下進行像差平衡。
