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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) (b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale  (c) an optical instrument that can measure length to within a wavelength of light ?

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Optical instrument is the most suitable device to measure length.
answered May 28, 2014