Question

2.6 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 lig
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Answer 1

Answer:

(c) an optical instrument that can measure length to within a wavelength of light

Explanation:

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