The position of the eye is very important for taking measurements. There might be an error in the reading if our eye position is not proper. This error is known as ___ error.

Parallax error

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zero

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instrumental

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Both A and B

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Solution

The correct option is A Parallax error
Parallax error arises when the reading is taken from a random angle. It is a non-technical (human) error in which there is a difference in the readings if the readings are taken at different angles from the line of sight. So, to avoid this error, we must always take the readings by positioning our eyes just perpendicularly above the markings.

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