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light pen by Mind Map: light pen

1. Describtion:a light pen is a special surface on a screen sensitive to the tough surface of a pen

2. Disadvantages: small in size so it can get lost easily

3. Advantges:light pens are easy to use

4. Advantges:They have extremely good positional accuracy

5. Disadvantges:light pen requires special implementations

6. Disadvantges:sometimes gives false reading due to background lighting in a room