Discuss the following devices: (a) Light Pen (b) Graphic tablet (c) CD-ROM (d) DVD

Q. Discuss the following devices:

(a) Light Pen

(b) Graphic tablet

(c) CD-ROM

(d) DVD

Answer :-

(a) Light Pen :- A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.

(b) Graphic tablet :- A graphics tablet is a computer input device that enables a user to hand-draw images, animations and graphics, with a special pen-like stylus, similar to the way a person draws images with a pencil and paper. These tablets may also be used to capture data or handwritten signatures.

(c) CD-ROM :- Compact Disk (CD) It is a thin optical disk which is commonly used to store audio and video data. The capacity of standard 120mm CD is 700MB. Transfer speed is mentioned as a multiple of 150 KB/s, for example, 4X means 600 KB/s.

(d) DVD :- Digital Versatile Disc or Digital Video Disc is an storage device. It can be recorded on single side or on double side. Its capacity may range from 4.7 GB to 8.5 GB.