Question

Give reasons - while taking measurement using a ruler, eyes should be vertically above the scale .

Answer 1

The eye must be kept vertically above the end of the object so that the corresponding graduation can be read clearly. If the eye is not kept exactly vertically above the end of the object, it leads into error called parallax error.


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Answer 2

Answer:

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Explanation:

For taking measurements, correct position of the eye is very important. The I must be exactly vertically above the mark to be read. In other positions of the eye, pte reading due to wrong positioning of eye is called parallax error.