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Assertion (A): If in five complete rotations of the circular scale, the distance travelled on main scale of the screw gauge is \( 5 \mathrm{~mm} \) and there are 50 total divisions on circular scale, then least count is \( 0.001 \mathrm{~cm} \).

Reason (R): Least count \( \frac{\text { Pitch }}{\text { Total divisions on circular scale }} \)
In the light of the above statements, choose the most appropriate answer from the option given below
- (a) A is not correct but \( \mathrm{R} \) is correct.
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are correct and \( \mathrm{R} \) is correct explanation of \( \mathrm{A} \)
(c) A is correct but \( \mathrm{R} \) is not correct
(d) Both \( A \) and \( \mathrm{R} \) are correct and \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \).
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