Optic axis of a thin equiconvex lens is the x-axis. The co-ordinates of a point object and its image are $(-40\;cm,1\;cm)$ and $(50\;cm,-2\;cm)$ respectively . lens is located at

Question

$(a)\;x=15\;cm \\ (b)\;x=10\;cm \\ (c)\;x=20\;cm \\ (d)\;x=-25\;cm$