Which of the following is the most precise device for measuring length? (a) A vernier callipers ...

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Which of the following is the most precise device for measuring length?
(a) A vernier callipers with 20 divisions on the sliding scale
(b) An optical instrument that can measure length to within a wavelength of light
(c) A screw gauge of pitch \( 1 \mathrm{~mm} \) and 100 divisions on the circular scale
(d) All the above are equally precise
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