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Q: _____ 'n' division of the vernier scale are equal in length to (2n- 1) divisions of the main scale.
  • A. Double vernier
  • B. Retrograde vernier
  • C. Double folded vernier
  • D. Extended vernier
Correct Answer: Option D - See the above explanation.
D. See the above explanation.

Explanations:

See the above explanation.