Abstract: A retroreflector assembly is assembled by adhering a retroreflector to a mounting member along a single flat back surface of the retroreflector and a flat surface of the mounting member. The retroreflector does not otherwise contact the mounting member. The retroreflector includes three plates having optically flat reflective front surfaces disposed at right angles to each other, wherein each of the plates further has a back surface disposed on an opposite side of the plate from the optically flat reflective front surface. The mounting member comprises a bonding portion and a base portion connected to the bonding portion, wherein the bonding portion is adhered to the back surface of one of the three plates, and wherein the bonding portion comprises a same material as the one of the three plates to which the bonding portion is adhered.