A device which is used for measurement of length to an accuracy of about \( 10^{-4} \mathrm{~m} ...

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A device which is used for measurement of length to an accuracy of about \( 10^{-4} \mathrm{~m} \), is
(a) screw gauge
(b) spherometer
(c) vernier callipers
(d) Either (a) or (b)
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