| 释义 |
凸透镜tūtòujìng透镜的一种,中央比四周厚,平行光线透过后,向轴线的方向折射聚集于一点上。物体放在焦点以内,由另一侧看去就得一个放大的虚像。远视眼镜的镜片就属于这个类型。{convex lens; a kind of lens that is thicker at the centre than the edge, through which parallel light refracts in the direction of the axis and concentrates at one point, and which creates an enlarged virtual image of an object at the other side within its focus, used in spectacle lenses for long sight;}也叫also会聚透镜{huìjùtòujìng},通称{generally called}放大镜{fàngdàjìng}。 |