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# One micron is equal to

$\begin{array}{1 1}(A)\;10^{-12} cm \\(B)\;10^{-8} cm \\(C)\;10^{-6} cm \\(D)\;10^{-4} cm \end{array}$

$1\mu m =10^{-6} m=10^{-4}cm$
Hence D is the correct answer.