CBSE Class 9 Computer Applications
Question 67 of 75
Types of Hardware — Question 29
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Question Question 29
When is a bar code reader used for input and how ?
A barcode reader is used to read bar codes which can be found on products in shops. The barcode reader uses lasers to identify the position and thickness of the bars. These bar codes convey the required information to the computer and make the billing smooth and efficient.