In this paper, a measuring method of convex lens foci in collimator is given.
2
在单色光、小物条件下，球差是引起薄凸透镜焦距的测量误差的主要因素。
Under conditions of monochromatic light and a small object, the spherical aberration was the main factor which led to measuring error of focus of thin convex lens.
3
复合显微镜包括两个短焦距凸透镜，即位于镜筒两端的物镜和目镜。
The compound microscope consists of two convex lenses with short focal length, the objective and eyepiece lenses, fitted at opposite ends of a tube.
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