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 ?
NCERT Solutions for Class 11 Physics Part 1 Chapter 2 Exercise 6
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(c) - is the answer.
Optical instrument has least count so it is the most precise device for measuring length.
Optical instrument has least count so it is the most precise device for measuring length.
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