This he opened and made a very careful examination of the sill with his powerful magnifying lens.
他打开这扇窗户，用随身携带的高倍放大镜非常仔细地检查窗台。
Magnifying lens
原声例句
福尔摩斯探案之绿玉皇冠案
TED Radio Hour
I can buy a $5 magnifying lens and put it in front of my camera, and so now you've got, essentially, a pretty decent microscope, especially for bugs.
我可以买一个 5 美元的放大镜并将其放在相机前，所以现在你基本上已经拥有了一个相当不错的显微镜，尤其是对于昆虫来说。
Crash Course 综合篇
Now, if you want to calculate the magnifying power of the telescope, just start with the same equation you used for the magnifying lens, but with a negative sign, because the image is flipped.
现在，如果你想计算望远镜的放大倍率，只需从用于放大镜的相同方程开始， 但要加上一个负号， 因为图像是翻转的。
中文百科
放大镜 Magnifying glass
（重定向自Magnifying lens）
放大镜（Magnifying glass）是用以放大物体的凸透镜，显微镜的雏形。
放大透镜的历史可追溯至古埃及，约西元前五世纪，以埃及的象形文本表示「一片玻璃透镜」。最早的文本记载则可追溯到古罗马，约公元前一世纪，罗马皇帝尼禄的导师塞内卡写道「无论多小或模糊的文本，透过球体或注满水的玻璃壶就会放大」。亦有一说尼录皇帝曾以一个祖母绿宝石当做凸透镜来观赏斗士比赛。
早于千多年前，人们已把透明水晶或宝石磨成「透镜」，这些透镜可放大影像。
英语百科
Magnifying glass 放大镜
（重定向自Magnifying lens）
A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle (see image).
A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner. This arrangement is known as a Fresnel lens.
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