Discussion
Comparing a vernier with a diagonal scale, the vernier
Answer: C
Correct answer: resolves finer but must be made and read with more care
The vernier obtains its resolution from the difference between two nearly equal divisions rather than from subdividing a line, so it can read finer than a diagonal scale of the same size. The cost is precision of construction and care in reading: the coincidence of lines must be judged correctly, and a misjudgement gives a wrong answer that looks perfectly definite.
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