但是当望远镜镜片直径翻一番时，如果设计不变，其重量会增加四倍。
But doubling the diameter of the telescope's mirror, without changing its design, would increase its weight fourfold.
伽利略并没有发明望远镜，但在1609年听到有人制造了这种光学仪器后，他很快用管风琴管和眼镜镜片制造了自己的望远镜。
Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he quickly built his own device from an organ pipe and spectacle lenses.
磨制巨型望远镜的镜片价格非常昂贵。
The lenses for giant telescopes are very expensive to grind.
而纠正这一失误需要在望远镜的光路上加装校正镜片——也就是后来广为人知的“哈勃的眼睛”。
The fix would mean introducing corrective optics into the telescope's light path - Hubble's spectacles, as they came to be known.
就在1990年4月哈勃太空望远镜发射后不久，NASA的工程师们惊讶地发现，其中一块镜片上的瑕疵使得传回来的照片都变得模糊不清。
Just weeks after the launch of the Hubble space telescope in April 1990, NASA engineers were aghast to discover that a flawed mirror was blurring the relayed images.
凯克望远镜采集和集中光线的大型镜片和南非大望远镜类似，是由一组小镜片拼接成的曲面镜。
The massive mirrors that collect and focus light are, like SALT's mirror, an array of smaller mirrors arranged on a perfectly formed curve.
镜片常被用来做成望远镜。
显微镜、望远镜片，枪瞄等抛光。
随着科学相机和摄谱仪低温试验的完成以及最后飞行镜片(副镜)的安装，NASA的詹姆斯·韦伯太空望远镜最近进一步接近了发射。
NASA's James Webb Space Telescope just got a little closer to launch with the completion of cryogenic testing on its science cameras and spectrographs and the installation of the final flight mirrors.
其中之一就是1993年在轨道上修复哈勃天文望远镜；如果没有宇航员安装新镜片，这个巨大昂贵的望远镜卫星就是一堆废铁。
One was the 1993 in-orbit repair of the Hubble Space Telescope; without astronauts to fit new lenses, the enormously expensive satellite would have been a flop.
镜片刚体运动误差、表面误差、表面粗糙度、表面散射和衍射是影响X射线成像望远镜成像质量的主要因素。
Rigid body motion, surface errors, surface roughness, surface scattering and diffraction are mainly reasons which affect image quality of the X-ray imaging telescopes.
镜片刚体运动误差、表面误差、表面粗糙度、表面散射和衍射是影响X射线成像望远镜成像质量的主要因素。
Rigid body motion, surface errors, surface roughness, surface scattering and diffraction are mainly reasons which affect image quality of the X-ray imaging telescopes.
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