In a vernier calipers 10 smallest divisions of the vernier scale are equal to 9 smallest divisions of the main scale. If the smallest division of the main scale is half millimeter, then the vernier constant is:
A
0.005mm
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B
0.05mm
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C
0.5mm
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D
0.01mm
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Solution
The correct option is B0.05mm MSD = Main scale divisions VSD = Vernier scale divisions
From the data given in the question, 1MSD=0.5mm and, 10VSD=9MSD ⇒1VSD=910MSD=910×0.5=0.45mm
Vernier constant(VC) or Least count(LC), =1MSD−1VSD=0.5−0.45=0.05mm
Hence, option (b) is the correct answer.