A new method of measuring the monochrome focal length of lens is given from the single slit diffraction principle.
根据单狭缝衍射原理，提出了一种测量透镜单色焦距的新方法。
Please sit at the slit lamp, look straight, blink, again, look up please, let me push the lens, good, we are finished.
请坐到裂隙灯前面，向前看，请眨眼，再眨一次，向上看，让我用手指来推推镜片，很好，查完了。
Please sit at the slit lamp, look straight, blink, again, look up please, let me push the lens, good, we are finished.
请坐到裂隙灯前面，向前看，请眨眼，再眨一次，向上看，让我用手指来推推镜片，很好，查完了。
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