Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards .A current in the coil produces a defection of $35^{\circ}$ of the mirror . What is the displacement of the reflected spot of light on ascreen 1.5 m away ?

Question

$\begin{array}{1 1} 0.18\;cm \\ 0.18\;m \\ 1.8 \;cm \\ 1.8\;m \end{array} $