Assertion A : If in five complete rotations of the circular scale, the distance travelled on main scale of the screw gauge is 5 mm and there are 50 total divisions on circular scale, then least count is 0.001 cm .
Reason R : Least Count $=\frac{\text { Pitch }}{\text { Total division on circular scale }}$
In the light of the above statements, choose the most appropriate answer from the options given below:
Select the correct option:
A
A is not correct but R is correct.
B
Both A and R are correct and R is the correct explanation of A.
C
A is correct but R is not correct.
D
Both A and R are correct and R is NOT the correct explanation of A.
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