While measuring length using a meter scale, the position of the eye

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Should be vertically above the 0-mark of the scale.

Should be vertically above the point where the measurement is to be taken.

Should be a little away from the point where the measurement is to be taken.

Does not matter as long as the scale is accurate.

answer is B.

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Detailed Solution

The position of the eye should be vertically above the point where the measurement is to be taken while measuring the length.
While noting the outcome, keep your eyes directly in front of the reading. The parallax error is produced by improper eye positioning while taking a reading. To avoid the parallax error, if the ruler is placed horizontally, the eyes should be positioned vertically above the mark.

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