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Kelly is measuring an object with a metric ruler. to minimize parallax, she should
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To minimize parallax, it should position the ruler so that the edge is against the object.
When the length of an object is measured less or more than the original length of that object, a Parallax error occurs. The main reason for this type of error is the incorrect positioning of the eye to the measurement marking angle. On a scale, an object is seen at a different or modified location. When one looks at an object at right angles corresponding to the scale. This is where the parallax error comes in.
This error can be minimized by placing the device used for edge measurement. This will result in the same level being made for the measuring device and the object to be measured.