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。

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。

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。