N divisions on the main scale of a vernier callipers coincide with (N + 1) divisions on the vernier scale. If each division on the main scale is 'a' units, then the least count of the instrument is

N divisions on the main scale of a vernier callipers coincide with (N

1.	N divisions on the main scale of a vernier callipers coincide with (N + 1) divisions on the vernier scale. If each division on the main scale is 'a' units, then the least count of the instrument is
Answer» `(a)/(N+1)` `(a)/(N-1)` `(N)/(N+1)` `(a)/(N)` ANSWER :A