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Which of the following is the most recis...

Which of the following is the most recise device for measuring length?

A

A vernier calliper with 20 divisioins of the sliding scale

B

An optical insturment that can measure length within wavelength of light

C

A screw gauge of pitch `1mm` and 100 division on the circular scale

D

None of the above

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(b) An optical instrument gives most precise measurement.
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Which of the following is the most precise devise for measuring length ? (a) a Vernier callipers with 20 divisions on the sliding scals, coindiing with 19 main scale divions (b) a screw gauge of pitch 1mm and 100 divisions on the circular scale (c ) an optical instrument that can measure length to within a wave length of light.

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