In Fig. 35-30, a light wave along ray r1 reflects once from a mirror and a light wavealong ray r2 reflects twice from that same mirror and once from a tiny mirror atdistance L from the bigger mirror....

In Fig. 35-30, a light wave along ray r1 reflects once from a mirror and a light wavealong ray r2 reflects twice from that same mirror and once from a tiny mirror atdistance L from the bigger mirror. (Neglect the slight tilt of the rays.) The waves havewavelength l and are initially exactly out of phase. What are the (a) smallest, (b)second smallest, and (c) third smallest values of L/l that result in the final waves beingexactly in phase?