Question

Which of the following is the most precise device for measuring length?
(a) a Vernier calliper with 20 divisions on the sliding scale coinciding with 19 main scale division
(b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale
(c) an optical instrument that can measure length within a wavelength of light?

Answer 1

Vernier calliper is used to measure lenght.

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