$\begin{array}{1 1}(a)\;0.05cm\\(b)\;0.01cm\\(c)\;0.005cm\\(d)\;0.001cm\end{array}$

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Value of 1 main scale division MSD=0.5mm

Least count=1MSD=0.5mm

20MSD=1cm

1MS=$\large\frac{1}{20}$cm

50VSD=49MSD

$1VSD=\large\frac{49}{50}$MSD

$\Rightarrow \large\frac{49}{50}(\frac{1}{20})cm$

$\Rightarrow \large\frac{49}{1000}cm$

LC=$(\large\frac{1}{20}-\frac{49}{1000})$cm

$\Rightarrow \large\frac{1}{1000}$cm

$\Rightarrow 0.001cm$

Hence (d) is the correct answer.

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