7. A light ray I is in mirror is rotated in the figure by an arrow at fr reflected by the mirror a distance 10 m from the v I is incident on a plane mirror M. The tated in the direction as shown in the an arrow at frequency 9/1 rps. The light d by the mirror is received on the wall W at nce 10 m from the axis of rotation. When the ole of incidence becomes 37° the speed of the spot (a point) on the wall is: MTOTT (a) 10 m/s (c) 500 m/s 10 m -EW (6) 1000 m/s (d) None of these