In a vernier caliper, 10 divisions of vernier scale is equal to 9 divisions of main scale. One main scale division is equal to
. While measuring diameter of a spherical body, it is observed that zero of vernier scale lies between 30 and 31 divisions of main scale reading and 6 th vernier scale divison exactly coincides with the main scale reading. The diameter of the spherical body is
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Given, 
Least count, 

The diameter of the spherical body is

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