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汉语拼音：tū tòu jìng

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。通称放大镜。

1. 称会聚透镜，通称放大镜。透镜的一种。中央比四周厚，平行光线透过以后，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。阳光通过后聚集成一个温度很高的光点，火柴和薄纸能被烧着。凸透镜可做各种光学用具的镜头。

• A convex lens can be used to concentrate the sun's ray and thus burn a hole in a piece of paper.

  凸透镜可以用来聚集太阳光，将一张纸片烧穿一个洞。

• The invention provides a method with a concave lens focus as a welding heat source and a welding device thereof.

  本发明提供一种以凸透镜焦点为焊接热源的方法及其焊接装置。

• Also, as I have said, the bubbles themselves within the ice operate as burning-glasses to melt the ice beneath.

  还有是我已经说起过的，冰中间的气泡像凸透镜一样从下面起来溶解冰。

• He focused the sun's ray on a piece of paper with a burning-glass.

  他用一面凸透镜把阳光在纸上聚成焦点。

• It acts as a two-cylindrical lens system. The other is prepared by overlapping a line-type zone plate and a circular zone plate.

  另一种是一个线型波带板和一个圆型波带板的组合，效果相当于一个凸透镜和一个柱面透镜的组合。

• Just AS a double convex lens enlarges, so a double concave lens reduces.

  正象双凸透镜可以放大那样，双凹透镜也可以缩小。

• In yet another embodiment the sheath includes at its distal end a convex lens for use by a camera in obtaining images of said body cavity.

  而在另一个实施例中，鞘套在其远端包括凸透镜用于由摄像头使用以获得所述体腔的图像。

• a small positive lens at the back makes it easier for the photographer's eye to view this " minified " image.

  一个后部的凸透镜使摄影者的眼睛易于观看这个“缩小”的图像。

• She polished the convex lens of her telescope.

  她擦拭着望远镜的凸透镜