从薄透镜的焦距公式出发，讨论了各种透镜在不同介质中的会聚与发散性质。
From the focal distance formula of thin lens, the convergence and divergence nature of each kind of thin lens are discussed in different media.
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.
在白光照射下，衍射光学透镜的焦距不仅同材料色散和波长色散有关，而且还同孔径因子有关。
When the diffractive optical lens is illuminated by white light, its focal length not only relates to material dispersion and wavelength dispersion, but also to aperture factor.
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