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In a screw gauge, least count of the pit...

In a screw gauge, least count of the pitch scale is `0.5mm` and there are `50` divisions on its cap. When nothing is put between its jaws, `40^(th)` division of circular scale coincides with reference line, with zero of circular scale lying above the reference line. When a plate is placed between the jaws, main scale reads `2` divisions and circular scale reads `20` divisions. Thickness of the plate is ______________ `mm`

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