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.
• B.
• C.
• D.

Answer 1

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.