In optical astronomy, using a telescope and observing the stars that way, we rely on visible light waves.

在光学天文学中，在用望远镜观察恒星时，我们依靠的是可见光波。

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A sensor channels the light signal along an optical fibre.

传感器沿光导纤维输送光信号。

《牛津词典》

Bille and his team work with an optical instrument called an active mirror—a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies.

比尔和他的团队使用一种被称为“活动镜”的光学仪器，这是一种在天文望远镜的种类中用来发现新出现的恒星和遥远星系的仪器。

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It is called LaserFest. The American Physical Society, the Optical Society ,and SPIE, a group that supports the study of light, all have been involved.

VOA: special.2010.09.01

An optical mouse uses a beam of light and an optical sensor to detect movement over a surface -- there are no moving parts.

CNN: Review: Apple Pro Mouse

The PowerShot SX260 HS camera puts Canon's amazing optical reach into a pocket sized camera, with a 20x optical zoom (25mm to 500mm) letting you pull subjects in close.

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In addition to that, you'll get more than enough cables for hookup: a TOSlink optical cable, a TOSlink adapter for older Xbox systems, stereo RCA cables for older TVs and an AC adapter with a trio of international connectors.

ENGADGET: Tritton Warhead 7.1 Wireless Surround Sound Headset for Xbox 360 review