30@Kunl - me too getting the same answers!
Least Count - Main Scale Division - Vernier Scale Division
Vernier Scale Division - (n-2)*(Main Scale Division)/n
a-main scale divisions
n-no of vernier divisions
where n vernier scales coincide wid n-2 main scale divisions
I.a=1mm n=20
II.a=0.5 mm, n=10
III.a=0.5mm , n=20
IV.a=1mm, n=100
find least count in each case.
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2 Answers
30