Which of the following is/are true about least count of a screw gauge?

The distance traveled by the screw for a rotation of one division on the head scale.

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L.C =

\frac{D i s t a n c e t r a v e l e d o n t h e p i t c h s c a l e}{N o . o f r o t a t i o n s o f t h e h e a d s c a l e}

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It is the distance between two successive screw threads.

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L.C =

\frac{p i t c h}{N o . o f d i v i s o n s o n t h e h e a d s c a l e}

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Solution

The correct options are
A The distance traveled by the screw for a rotation of one division on the head scale.
D L.C = $\frac{p i t c h}{N o . o f d i v i s o n s o n t h e h e a d s c a l e}$
Least count is the distance moved by the tip of the screw for a rotation of one division on the head scale.
Thus, $L . C = \frac{p i t c h}{N o . o f d i v i s o n s o n t h e h e a d s c a l e}$

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