Young's Double Slit - Fringe Width

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OJ-Hick
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When measuring the fringe width of a superposition pattern from a monochromatic source - I am using a laser. What problems/inaccuracies could I have when measuring it?
 
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It's super small? Human error? Shot noise? H.E.P? Fabrication inadequacies? Airborne particles? Godzilla?

It's going to be a long list.
 

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