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Question

Ashwin is required to take the measurement of a wooden box. Which of the following should be the proper position of his eye for taking the reading?

A
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B
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C
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D
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Solution

The correct option is A

Ashwin must position his sight in such a way that his line of sight is perpendicular to the scale-readings. This is achieved by placing his eye exactly vertically above the scale. If this is not ensured, then he will observe a parallax error in the measurement.


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