Informatics Practices
Discuss the following devices:
(a) Light Pen
(b) CD-ROM
(c) DVD
Computer System
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Answer
(a) Light Pen — A light pen is a pointing device, basically a stylus, that can be used to select anything on the computer screen by simply pointing at it or for drawing figures directly on the screen. It consists of a photocell mounted on a pen-shaped tube and is capable of sensing a position on the screen when its tip touches the screen. Clicking is performed by pressing the pen on the screen. A light pen is mostly used by engineers, architects or designers.
(b) CD-ROM — Compact Disc is a thin optical disc which is commonly used to store audio and video data. The capacity of a standard 120 mm CD is 700 MB. Originally, CD-ROM drives had transfer rates of only 150 KB/sec which was considered very slow. The newest CD-ROM drives can transfer up to 72x, i.e., 10800 KB/sec.
(c) DVD — Digital Versatile Disc or Digital Video Disc is an optical disc storage device. It can be recorded on single side or on both sides. Its capacity may range from 4.7 GB to 17.08 GB.
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