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In a vernier callipers if each centimetre of the main scale is divided into q equal parts and p vernier scale divisions coincide with p - 1 main scale divisions, then what will be the least count?

Options

  1. Ap q p - 1
  2. Bq p
  3. Cq - 1 p q
  4. D1 p q

Correct answer

D. 1 p q

Step-by-step solution

1   M S D = 1 q p × VSD = p - 1 × MSD ⇒ 1   VSD = p - 1 p q L . C . = 1   MSD - 1 VSD ⇒ 1 q - p - 1 p q = 1 p q

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