A point source of light S, placed at a distance 60 cm infront of the centre of a plane mirror of width 50 cm, hangs vertically on a wall. A man walks…

A point source of light S , placed at a distance $\displaystyle 60$ cm infront of the centre of a plane mirror of width $\displaystyle 50$ cm, hangs vertically on a wall. A man walks infront of the mirror along a line parallel to the mirror at a distance $\displaystyle 1.2$ m from it (see in the figure). The distance between the extreme points where he can see the image of the light source in the mirror is \_\_\_\_ cm.