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In a vernier calliper N divisions of vernier scale coincides with (N – 1) divisions of main scale (in which length of one division is 1 mm). The least count of the instrument should be
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- N
- N – 1
- 1/10 N
- 1/N – 1
Correct Option: C
Least count = 1MSD – 1 VSD
| = 1 MSD - |  |  | MSD | |
| N |
| ( ∵ N VSD = (N - 1)MSD ∴ 1 VSD = | MSD ) | |
| N |
| = | MSD = | × | cm = | ||||
| N | N | 10 | 10 N |
