The smallest division on the main scale of a vernier callipers is \( 1 \mathrm{~mm} \), and 10 v...

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The smallest division on the main scale of a vernier callipers is \( 1 \mathrm{~mm} \), and 10 vernier divisions coincide with 9 main scale divisions. While measuring the diameter of a sphere, the zero mark of the vernier scale lies between \( 2.0 \) and \( 2.1 \mathrm{~cm} \) and the fifth division of the vernier scale coincide with a scale division. Then diameter of the sphere is
a. \( 2.05 \mathrm{~cm} \)
b. \( 3.05 \mathrm{~cm} \)
c. \( 2.50 \mathrm{~cm} \)
d. None of these
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