Rebound Projectile

A ball is dropped( initial velocity=0) on a smooth inclined plane forming an angle $\alpha$ with the horizontal.Having fallen the distance h,the ball rebounds elastically off the inclined plane.At what distance from the impact point will the ball rebound for the second time.Also find the angle $\theta$ shown in figure which is the angle the ball makes with inclined plane when it rebounds first time in terms of $\alpha$ .