A plane mirror made of a very thin piece of glass lies flat on the ground. As shown in Figure P24.10, one end of the mirror is 2.0 m from you and the other end is 30 m from a nearby tree. You are 1.8 m tall, and the mirror has a length L. The mirror is arranged so that you can just see the image of the top of the tree at one edge of the mirror.
(a) How tall is the tree?
(b) If you can just see a point halfway up the tree at the other edge of the mirror, what is L?