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In a vernier callipers, $10$ divisions of vernier scale coincides with $9$ divisions of main scale, the least count of which is $0.1\,cm$. If in the measurement of inner diameter of cylinder zero of vernier scale lies between $1.3\,cm$ and $1.4\, \ cm$ of main scale and $2^{nd}$ division of vernier scale coincides with main scale division then diameter will be $.......... cm$