$N$ divisions on the main scale of a vernier calipers coincide with $(N + 1)$ divisions of the vernier scale. If each division of main scale is $a$ units, then the least count of the calipers is
- A$\frac{a}{N}$
- B$a$
- C$\frac{a}{N + 1}$
- D$\frac{N a}{N + 1}$
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