Question

Define scanner, track-ball and web camera

Answer 1

A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black-and-white only, or color.

A trackball is a computer cursor control device used in many notebook and laptop computers. The trackball is usually located in front of the keyboard toward the user. Essentially, the trackball is an upside-down mouse that rotates in place within a socket.

A webcam – short for 'web camera' – is a digital camera that's connected to a computer. It can send live pictures from wherever it's sited to another location by means of the internet. ... a light that, when on, will let you know that the camera is in use.

Answer 2

1) A scanner is an input device for digital image input.

2) It optically scans and copies picture, printed text, handwriting directly into the computer.

3) The first scanner developed was a drum scanner . It was built in 1957 at the US National Bureau of Standards by Russell Kirsch .

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And short note on web camera is in the photo.....

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