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 divisions on the circular scale. (c) an optical instrument that can measure length to within a wavelength of light?

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Guru ji

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Screw gauge,just find the smallest value the instruments can find(L.C.)with given values.
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Guru ji

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Correct answer is (C) an optical instrument that can measure length to within a wavelength of light. And it is because optical instrument has lowest least count than other two instruments provided in the problem.
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C IS THE CORRECT ANSWER
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C is the correct answer
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