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Which of the following is the most preci...

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 ?

A

Vernier calipers

B

Screw guage

C

Optical instrument

D

All the above

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The correct Answer is:
C
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AAKASH SERIES-UNITS AND MEASUREMENTS-EXERCISE -1 A
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