Magnification of a microscope is 150. A person find the average width of a thread to be 3 mm . what is estimate of thickness of thread

Question

$\begin{array}{1 1} (a) \;0.03\;mm \\ (b) \;0.02\;mm \\ (c) \;0.01\;mm \\ (d) \;0.3\;mm \end{array}$