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Q.

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

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a

A vernier callipers with 20 divisions on the sliding scale

b

An optical instrument that can measure length to within a wavelength

c

The gauge of pitch 1 mm and 100 divisions on the circular scale (c) A screw gauge

d

All the above are equally precise

answer is B.

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An optical instrument that can measure length to within a wavelength
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Which of the following is the most precise device for measuring length?