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The length of an object is measured usin...

The length of an object is measured using a vernier system whose main scale is 30 cm long with 600 divisions. If 19 divisions of the main scale coincide with 20 divisions of the vernier scale, then its least count is

A

0.25 cm

B

0.025 cm

C

0.35 cm

D

0.0025 cm

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The correct Answer is:
D
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