Newton's three laws, the universal law of gravitation, the reflecting telescope to check his work, and optics, and all this crazy stuff in that two years that he had stopped learning.

牛顿三大定律，万有引力定律，用反射式望远镜来验证他的假设， 还有光学相关的，在他停止学习的那两年中， 做了所有这些看似疯狂的事。

Fresnel telescopes have not been developed in the past because the image formed by one that was large enough to rival a useful-sized reflecting telescope would be several kilometres from the zone plate.

过去，菲涅尔设计的望远镜还制造不出来，因为要想使衍射望远镜的大小和正常使用的反射望远镜大小相同，它所产生的图像就会距离波带片数千米远。

Many, like the Hubble Space Telescope, are reflecting telescopes, using mirrors as the objective lens so that they can have huge openings, taking in as much light as possible in order to best capture images of distant objects.

许多，如哈勃太空望远镜， 都是反射望远镜， 使用镜子作为物镜， 这样它们就可以有巨大的开口，吸收尽可能多的光线， 以便最好地捕捉远处物体的图像。