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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 ?

1 Answer

Optical instrument is the most suitable device to measure length.
answered May 28, 2014 by thanvigandhi_1