N division on main of the vernier callipers coincide with n+1 division of the veriner scale if each division on main scale is of a units , least count of instrument is
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(n+1)VSD=n MSD
1VSD =(n/n+1)MSD
Least count of vernier callipers
= 1MSD - 1 VSD
=[1-(n/n+1)]MSD
=1/n+1MSD
= a/n+1 unit
1VSD =(n/n+1)MSD
Least count of vernier callipers
= 1MSD - 1 VSD
=[1-(n/n+1)]MSD
=1/n+1MSD
= a/n+1 unit
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