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Which of the following is the most precise device for measuring length

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a vernier callipers with 20 divisions on the sliding scale

a screw gauge of pitch 1 mm and 100 divisions on the circular scale

an optical instruments that can measure length to within wavelength of light

all the above

answer is C.

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Detailed Solution

Every measuring instrument has an inherent limit of precision. This limit is determined by the least count of the instrument

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