Discussion
To achieve a least count of 0.02 mm from a main scale divided into 0.5 mm, the vernier must carry
Answer: B
Correct answer: 25 divisions
The least count is the main scale division divided by the number of vernier divisions: \[ n = \frac{0.5}{0.02} = 25. \] So 25 vernier divisions are made to span 24 main divisions, which is the standard construction of a metric caliper reading to two hundredths of a millimetre.
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