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Q.

While measuring length using a meter scale, what should be the position of the eye?


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a

Vertically above the zero mark of the scale.

b

Vertically above the point where the measurement is to be taken.

c

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

d

Does not matter as long as the scale is accurate. 

answer is B.

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Detailed Solution

While measuring length using a meter scale the position of the eye should be vertically above the point where the measurement is to be taken. This is because of parallax error. So, a parallax error is the clear visibility difference in an object’s position as it is viewed from different angles.
 
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While measuring length using a meter scale, what should be the position of the eye?