| 词汇 | speculum-mirror |
| 释义 | speculum mirror noun[ C ] uk /ˈspek.jə.ləm ˌmɪr.ər/ us /ˈspek.jə.ləm ˌmɪr.ɚ/ a type of mirror made from speculum metal(= a mixture of copper and tin) that was used in old telescopes(= devices for looking at stars and other things that are far away): （旧时望远镜中所使用的）铜锡合金反射镜 The Melbourne reflector was the last major telescope to be equipped with a speculum mirror.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 speculum mirror will bend three times as much as a glass one because it will be three times as heavy. The largest ever speculum-mirror-based telescope was built by William Parsons. The radius of curvature of the speculum mirror was 6.55 metres. Lassell's 47-inch reflector, made in 1860, was the last large reflector with a speculum mirror. Physics: optics, microscopy & lasers anti-reflection anti-reflective chromatic aberration concentrator converging lens eyepiece field glasses non-dispersive non-reflecting opera glasses optical density optics polarization polarize reflection reflective refract spotting scope spyglass transparency |
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