which of the following is the most precise device for measuring length
(a) a vernier callipers with 20 divisions on the sliding scale.
(b) a screw gauge of pitch 1 mm and 100 division on the circular scale.
(c) an optical instrument that can measure length within a wavelength of light ?
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(c) an optical instrument that can measure length within a wavelength of light
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Answer:
a) is the answer... hope I am correct
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