If you focus the sun's rays on dry wood with a burning-glass, it will start burning.

如果你用取火镜使太阳光线聚焦在干木头上，木头就会燃烧起来。

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The Ivanpah project USES mirrors called heliostats to focus the rays of the sun onto a solar receiver on top of a tower.

艾文帕项目使用一种叫定日镜的镜子来把太阳的光线集中到位于塔顶的太阳能接收器上。

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After the procedure, your cornea should bend (refract) light rays to focus more precisely on your retina rather than at some point beyond or short of your retina.

完成手术程序后的角膜可以使光线更精确的发生折射，形成的焦点位于视网膜上，而不是超过或者达不到视网膜。

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And that depends on being able to see the lower-energy radiation, in order to pinpoint what it was that exploded (gamma rays are impossible to focus, so the location of a burst is known only approximately).

ECONOMIST: Astronomy

Nustar is unprecedented in its ability to focus in on distant parts of the cosmos in these high-energy X-rays.

BBC: First glimpse of a black hole's spin