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I'm assuming you're measuring somethings' displacement along a scale.
There are three simple ways of reducing parallax error in that case:
1: Attach a straight object (like a ruler or straightened paperclip) to the thing you're measuring the displacement of, it should stick out of the object perpendicularly to the scale you're measuring the displacement on.
2: Make sure that object is as close to your scale as possible, but not touching.
3: Put your eyes level with the object, and as close to it as you safely can.
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Why should parallax errors be avoided?
parral error should be avoided cause it can cause a disaster
How can the parallax error be avoided?
By looking at the object straight, instead of from either side?
How can parallax error be avoided?
To help the user avoid this problem, the scale is sometimes printed above a narrow strip of mirror, and the user positions his eye so that the pointer obscures its own reflection. This guarantees that the user's line of sight is perpendicular to the mirror and therefore to the scale. Parallax is thus avoided.
What is an parallax error?
The difference between an actual correct view and a displaced visual parallax error
What is the difference between random and systemic error?
Systemic or precisely Systematic Error in a reading taken by an instrument occurs due to the parts installed in it. Random error occurs when we get a number of repetitive readings during the same experiment because of human error. Perfect example for random is "Parallax Method".
