1. The problem statement, all variables and given/known data Prove the complex amplitude reflectance of a spherical mirror is given as exp[-jk(x2+y2)/R] 2. Relevant equations Transmittance of a spherical mirror is also exp[jk(x2+y2)/2f] 3. The attempt at a solution I have totally no idea how to go about doing this. Can I just say that the reflectance is the same as the transmittance just that the wave changes the direction of propagation?