Discussion
A vernier scale is preferred to a diagonal scale where the requirement is
Answer: A
Correct answer: greater precision than the diagonal construction gives
A vernier resolves finer than a diagonal scale of comparable size, because the resolution depends on the difference between two nearly equal divisions rather than on how finely a line can be subdivided by eye. The price is that it must be made and read with greater care, and a misread coincidence gives a wrong answer with no warning.
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