[" A listin (n is incident on a plane mirror M.The "],[" miner is rotated in anticlockwise direction as "],[" athown in the figure by an arrow at frequency "],[" gir the light rehlected by the mirror is "],[" mocived on the wall War distance "10m" from the "],[" axis of rotation.When the angle of incidence "],[" becomer "37^(7)" the speed of the spot (a point) on "],[" the wall is "]