Question

If S and V are one main scale and one Vernier scale and
n - 1 divisions on the main scale are equivalent to n
divisions of the Vernier, then
(1) The least count is S/n.
(2) The Vernier constant is S/n.
(3) The same vernier constant can be used for circular Ver-
niers also.
(4) The same vernier constant cannot be used for circular
Verniers​

Answer 1

1,2,3 correct

Least Count = 1MSD - 1 VSD
= S - [( n-1)/n]S
= S [ 1 - ( n-1)/n]
= S [ n - n +1 ]/n
= S/n
Least Count = Vernier constant = S/n