“2018年IAO理论低年组第1题-水银镜面”的版本间的差异
来自astro-init
（创建页面，内容为“'''Mercury mirror'''”） |
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| − | '''Mercury mirror''' | + | '''Mercury mirror.''' As you know. If one rotates a vessel with mercury, its surface will take a parabolic form. A kiquid mirror obtained in this wan can be used as the main mirror of a telescope. The Polar Bear-astronomer living in the Arctic decided to use this idea and build such a telescope exactly at the Norht Pole, and use the daile revolution of the Earth as the rotation mechanism so that the main mirror would have a long focal length. |
2019年9月12日 (四) 21:50的版本
Mercury mirror. As you know. If one rotates a vessel with mercury, its surface will take a parabolic form. A kiquid mirror obtained in this wan can be used as the main mirror of a telescope. The Polar Bear-astronomer living in the Arctic decided to use this idea and build such a telescope exactly at the Norht Pole, and use the daile revolution of the Earth as the rotation mechanism so that the main mirror would have a long focal length.
