It has a lens system to focus light onto the film at the back of the camera.

它的镜片系统可以将光线聚焦到相机后部的胶片上。

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One possibility was using your own star as an incredibly powerful lens to amplify light and radio signals.

一种可能性是，利用你自己的星体作为功能非常强大的透镜放大光线和无线电信号。

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A gravitational lens is formed when light is bent by a massive object.

引力透镜现象就是光被巨大质量物体弯曲的现象。

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I turned on a strong light under the glass and looked through the diamond lens.

VOA: special.2011.06.25

There is also a powerful LED light surrounding the lens for adding light to close up shots.

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Instead of having spectacles with a crude red filter for one eye and green for the other, the Real D system relies on circularly polarised light with one lens polarising the light to the left, and the other to the right.

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Driven by Lumus' patented Light-guide Optical Element, a micro-display pod, and the Optical Engine which projects light into the lens -- where it is reflected back to the user's eye via reflectors embedded in the lens -- the Lumus' DK-32 delivers a bright 720p 3D-capable display that only weighs 27 grams.

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