The main scale of Vernier callipers have n equal divisions per cm. n divisions of main scale is equal to (n+2) divisions of Vernier scale. The least count of the Vernier callipers is
A
1 cmn(n+2)
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B
2 cmn2
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C
2 cmn(n+2)
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D
4cmn2(n+2)2
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Solution
The correct option is C2 cmn(n+2) Answer (1)
Least count (LC)=1MSD−1VSD ⇒LC=1ncm−(nn+2)1ncm =1ncm(n+2−nn+2) =2 cmn(n+2)