When combined with a suitable light source and projection optics, the array of mirrors can project an image.

ECONOMIST: Curtains for celluloid

Cisco Though a laggard in optics, it has seen the light and is buying talent at a fast pace.

FORBES: Young guns...

Come 2012, Light Blue Optics wants to go high volume, selling between 10, 000 and 100, 000 devices the size of a mobile phone, that can project an even bigger image (15 inches wide), and soon after that bring out a device the size of a USB stick.

FORBES: Meet The Projector That Could Put The iPhone's Screen On Your Desk

And in the science of optics, the fact that the speed of light is constant in a vacuum is taken for granted.

FORBES: Why Marco Rubio Needs To Know That The Earth Is Billions Of Years Old

Scholars studying works on optics by Greek and Arabic scientists did experiments on the nature of light using lenses and invented eye glasses in the process.

FORBES: What Are Examples of Things in the "Common Knowledge" about History That Historians Almost Universally Consider Incorrect?

With a built-in Fujinon wide angle 23x zoom lens, superior low-light performance, and excellent sensitivity (F11 at 2000 lux), the GY-HM650 has ideal optics for challenging shooting environments.

ENGADGET: JVC demos GY-HM600, launches HM650 Mobile News Camera with WiFi and FTP at NAB

In visible light, all stars appear as points, only smeared out into a small circle by the atmosphere and by the optics of the telescope.

ECONOMIST: Planetary formation