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Which of the following is the most precis device for measuring length:(a) a vernier calipers with 20 divisions on the sliding scale?(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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Answer» An optical instrument which can measure length within a wavelength of light (=10-6 m) is the most precise device for measuring the length. So,(c) is the correct answer. |
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