Optics

Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.

Most optical phenomena can be accounted for using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that cannot be accounted for in geometric optics. Historically, the ray-based model of light was developed first, followed by the wave model of light. Progress in electromagnetic theory in the 19th century led to the discovery that light waves were in fact electromagnetic radiation.

Optical 88

Optical 88 (Chinese: 眼鏡88) is one of the famous eyewear stores in Hong Kong. It was established in 1984, as a member of Stelux Group of Companies, who owns largest professional optical retail network in Hong Kong.

Areas served

Optical 88's headquarters is located in Hong Kong (dispersed all over Hong Kong Island, Kowloon and the New Territories) while overseas stores are located at various countries and cities including Macau, Guangzhou, Singapore, Thailand and Malaysia etc.

Products and Services

Optical 88's key products are eyeglasses, including sunglasses and the frames and lenses of these glasses. They mainly provide customers eyeglasses-making services and Eye examination services.

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Cable

An electrical cable is made of two or more wires running side by side and bonded, twisted, or braided together to form a single assembly, the ends of which can be connected to two devices, enabling the transfer of electrical signals from one device to the other. Cables are used for a wide range of purposes, and each must be tailored for that purpose. Cables are used extensively in electronic devices for power and signal circuits. Long-distance communication takes place over undersea cables. Power cables are used for bulk transmission of alternating and direct current power, especially using high-voltage cable. Electrical cables are extensively used in building wiring for lighting, power and control circuits permanently installed in buildings. Since all the circuit conductors required can be installed in a cable at one time, installation labor is saved compared to certain other wiring methods.

The term originally referred to a nautical line of specific length where multiple ropes, each laid clockwise, are then laid together anti-clockwise and shackled to produce a strong thick line, resistant to water absorption, that was used to anchor large ships. In mechanics, cables, otherwise known as wire ropes, are used for lifting, hauling, and towing or conveying force through tension. In electrical engineering cables are used to carry electric currents. An optical cable contains one or more optical fibers in a protective jacket that supports the fibers.

Cable length

A cable length or length of cable is a nautical unit of measure equal to one tenth of a nautical mile or approximately 100 fathoms. The unit is named after the length of a ship's anchor cable in the age of sail. The definition varies:

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Cable (British band)

Cable were a British indie rock band originally from Derby, UK who released 3 albums in the late '90s: Down-Lift the Up-Trodden ('96), When Animals Attack ('97), and Sub-Lingual ('99), on Infectious Records. The band split up in 1999.

Formed in 1992 by Matt Bagguley and Darius Hinks, Cable were initially inspired by the art-rock leanings of indie-labels such as Touch and Go, Dischord, Blast First, Southern Records and Shimmy Disc, and also UK artists such as Spacemen 3 & My Bloody Valentine. The first settled line-up was Matt Bagguley (vocals/guitar), Darius Hinks (guitar), Pete Darrington (bass), Neil Cooper (drums) and throughout 1993 the band played regularly with underground acts from the U.S (such as Medicine, Polvo, Truman's Water, Rocket From The Crypt..) In early '94 their debut single "Sale of the Century" was released on 7", by Derby-based indie-label Krunch! Records. Radio 1 DJ John Peel played it immediately on his show saying it was the best thing he'd heard that week and phoned the band during the show to invite them to record a session. John Peel remained a loyal fan from that moment on, and altogether the band recorded 4 Peel Sessions.