Answer:
\[Pitch=\frac{dis\tan
ce\,moved}{number\,\,of\,complete\,rotations}=\frac{4mm}{4}=1mm\]
\[Least\,count=\frac{Pitch}{no.\,of\,divisions\,on\,circular\,scale}=\frac{1mm}{200}=0.005mm=0.0005\,cm\]
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