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Optical tweezers — (originally called single beam gradient force trap ) are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch… … Wikipedia
projection screen — ▪ optics surface on which the image from an optical projector is shown. Many materials are suitable for screens, the principal requirement being a high degree of reflectivity. The three most common types of screen are the mat white, the… … Universalium
Optical aberration — v · d · e Optical aberration … Wikipedia
Projection screen — Home theater projection screen displaying a high definition television image A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience. Projection… … Wikipedia
Optical modulators using semiconductor nano-structures — Contents 1 Optical modulators using semiconductor nano structures 1.1 Electro optic modulator of nano structures 1.2 Acousto optic modulator of nano structures … Wikipedia
Projection keyboard — A projection keyboard is a virtual keyboard that can be projected and touched on any surface. The keyboard watches finger movements and translates them into keystrokes in the device. Most systems can also function as a virtual mouse or even as a… … Wikipedia
projection television — a television picture display system consisting of a special receiver and an optical system that projects an enlarged picture on a screen. * * * … Universalium
optical image — ▪ optics the apparent reproduction of an object, formed by a lens or mirror system from reflected, refracted, or diffracted light waves. There are two kinds of images, real and virtual. In a real image the light rays actually are brought to … Universalium
projection television — noun : a television picture that is picked up from a picture tube of relatively small size and that by means of an optical system is greatly magnified and projected on a large screen … Useful english dictionary
Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals … Wikipedia
Movietone sound system — The Movietone sound system is a sound on film method of recording sound for motion pictures that guarantees synchronization between sound and picture. It achieves this by recording the sound as a variable density optical track on the same strip… … Wikipedia