| 释义 |
凸透镜 tū tòu jìng
基本例句
convexconvex lensconvex glasssunglassburning glasspositive lensmagnifying lens繁体凸透鏡近放大镜反凹透镜正象双凸透镜可以放大那样，双凹透镜也可以缩小。Just as a doubleconvexlens enlarges, so a double concave lens reduces.
他用一面凸透镜把阳光在纸上聚成焦点。He focused the sun's ray on a piece of paper with a burning-glass. |