12.Some of these telescopes have glass lenses in them.其中一些望远镜里安装着玻璃透镜。 13.The curvature of the film is concentric with the mirror behind the meniscus.胶片的曲率是和弯月透镜后面的反射镜同心的。 14.a concave lens [mirror]凹透镜 [凹面镜] 15.meniscus (shaped) lens凹凸透镜,弯...
of the spectrometer. The spectrometer employs a reflecting concave mirror and prism assemblies having parallel entrance and exit surfaces. In accordance with a first embodiment, a single prism assembly is employed whereas the second described embodiment uses a pair of generally identical prism assemblies...
Each of the grooves has a length L (m) and a width B (m) such that L is twice greater than B, with the curvature starting from the nose of the floating bodies (1 and 2) representing a concave portion of the clothoid, passing through its inflection point in the convex part of the...
Meanwhile, the device adopts a flexible foam pan with sandpaper as the polishing tool to conform the profiles of complex curved parts with varying curvature radii to provide a more consistent and evenly distributed polishing force. A linear encoder is used to measure the axial position of the ...
one concave mirror is studied and designed. based on its gaussian optics and astigmatism analysis with young′s formulas and under the normalization condition with respect to the optical system′s focal length,the vertex curvature radius of the convex mirror should be chosen within the interval of...