[" Hence number of images "=(360)/(30)-1=11],[" 10."[" A small plane mirror placed at the centre of a spherical screen of radius "" R.A beam of light is fall "],[" on the mirror.If the mirror makes "],[" reflection from the mirror will be "],[" (1) "4 pi nR," (2) "2 pi nR]" ,the speed of light on the screen ar "2" t) "],[" Soln.(1) When plane mirror rotates through an angle "theta" ,the reflected ray rotates through an angle? "]