speculum mirror
noun[C]
uk/ˈspek.jə.ləm ˌmɪr.ər/us/ˈspek.jə.ləm ˌmɪr.ɚ/atypeofmirrormade fromspeculummetal(= amixtureofcopperandtin)that was used inoldtelescopes(=devicesforlookingatstarsand other things that arefaraway):
（旧时望远镜中所使用的）铜锡合金反射镜The Melbournereflectorwas the lastmajortelescopeto beequippedwith a speculummirror.墨尔本反射镜是最后一个装有铜锡合金反射镜的大型望远镜。
- A speculummirrorwillbendthreetimesas much as aglassone because it will be threetimesasheavy.
- Thelargesteverspeculum-mirror-basedtelescopewasbuiltby William Parsons.
- Theradiusofcurvatureof the speculummirrorwas 6.55metres.
- Lassell's 47-inchreflector, made in 1860, was the lastlargereflectorwith a speculummirror.
Physics: optics, microscopy & lasers
- anti-reflection
- anti-reflective
- chromatic aberration
- concentrator
- converging lens
- electron microscope
- field glasses
- lens
- magnification
- magnify
- magnifying glass
- opera glasses
- optics
- polarization
- polarize
- polarized
- polarizer
- reflect
- reflecting telescope
- reflection