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The smallest division on main scale of a...

The smallest division on main scale of a vernier caplliers is `1 mm and 10` vernier divisions coincide with `9` main scale divisions. While measuring the length of a line, the zero mark of the vernier scale lies between `10.2 cm and 10.3 cm` and the third division of vernier scale coincides with a main scale division.
(a) Determine the least count of the callopers.
(b) Find the length of the line.

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