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.
用一辅助凸透镜与一测微目镜进行平行光束的会聚，测出准直管玻罗板线对在辅助凸透镜焦平面上所成像的大小；
Then using another convex lens and a micrometer eyepiece the altered parallel rays is focused, and the imaging size of line pair of collimator imaged on the another convex lens is measured.
所述的观测镜是单筒目视镜，目镜用凹透镜制成，镜筒内部设有视距增长装置。
The observation lens is the single-tube visual lens, eyeglass is made of a concave lens, and the inner part of a lens tube is provided with a visual distance increasing device.
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