From Galileo's rudimentary refracting telescope, to Newton'sreflective telescope, to modern complex large astronomical telescopes, opticallenses have always been the core components of these observation devices. Theynot only propelled the transition of astronomy from visual observation toprecise measurement, but also promoted our understanding and comprehension ofthe essence of the universe.
Hubble SpaceTelescope
Keck Observatory
Atacama LargeMillimeter/submillimeter Array