[" Two planes mirrors A and B are aligned "],[" parallel to each other,as shown in the "],[" figure.A light ray is incident at an angle of "],[30^(@)" at a point just insident at and end of A."],[" The plane of incidence coincides with the "],[" plane of the figure.The maximum number "],[" of times the ray undergoes reflections "],[" maximum number of times reflections "],[" maximum number of times the ray "],[" undergoes reflections (including the first "],[" one) before it emerges out is "]