what is the error called when the eye is not vertically above the ruler marking?
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the error is called backlash error
navyakapadia1708:
it is parallax error
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The length of the object is obtained by subtracting higher reading from lower reading. 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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