Web Camera:
Web cam is a video camera whose output displays on a web page.
Scanner:
Scanner
is an input device. It is used to enter printed type of data into the computer.
Light Pen:
A
light pen is a hand held pointing device. It look like a pen. It is connected
by a wire to the computer. The pen sends information to the computer when user
touches the pen on the specific area of screen.
Track Ball:
It is
similar to mouse. It has a large rotating ball on the top. The body of the track
ball
is not moved. The ball is rolled with fingers.
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