A point source of light S, placed at
a distance L in front of the centre
of a plane mirror of width d, hangs
vertically on a wall. A man walks
in front of the mirror along a line
parallel to the mirror at a distance
2L from it as shown in the figure. The greatest distance
over which he can see the image of the light source in
the mirror is
A d/2
B d
C 2d
D 3d
The wording of the question isn't right!