提出了证明小圆孔具有正、负焦距的一种方法，简要地介绍了关于小孔眼镜的实验研究。
It is proved that a small circular aperture has the positive and minus focal distances, and the research experiments for small aperture glasses are introduced concisely.
提出了证明小圆孔具有正、负焦距的一种方法，简要地介绍了关于小孔眼镜的实验研究。
It is proved that a small circular aperture has the positive and minus focal distances, and the research experiments for small aperture glasses are introduced concisely.
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