Q.

To avoid parallax error

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a

eye should be placed exactly above the point where the measurement is to be taken

b

eye should be placed away from the point where the measurement is to be taken

c

eye should be placed obliquely to the point where the measurement is to be taken

d

none of these

answer is A.

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Detailed Solution

Eye should be placed exactly above the point where the measurement is to be taken.

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To avoid parallax error