That’s the distance at which parallel light rays converge after passing through a converging lens.

这是平行光线通过会聚透镜后会聚的距离。

That's the distance at which parallel light rays converge after passing through a converging lens.

这是平行光线 通过会聚透镜后会聚的距离。

That works because you’ve taken a bunch of incoming parallel rays, and placed your target of choice at the focal length of the magnifying glass.

这是可行的，因为您已经拍摄了一束入射的平行光线，并将您选择的目标放在放大镜的焦距处。

That works because you've taken a bunch of incoming parallel rays, and placed your target of choice at the focal length of the magnifying glass.

这是有效的，因为您已经获取了一组入射平行光线，并将它们对准放大镜的焦距。