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The internal jaws of a vernier calipers ...

The internal jaws of a vernier calipers were held tightly inside a hollow tube when the zero of the vernier scale showed a reading of 1.9 cm and the 18th division on the vernier scale. The thickness of the wall of the tube is 1 mm. If M.S. D. = 1 mm and the number of division on the vernier scale is 20, find the outside diameter of the hallow tube.

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Verified by Experts

(i) Outside diameter = Inside diameter + `(2 xx "thickness")`
(ii) 21.9 mm
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