P2: Consider an object O of height h at a distance do of a thin lens L with a focal length f. A screen H is placed after the lens at a distance dr. Using the matrix method (paraxial approx.): (a) Find the relation between do, di, and f so that the image of the object O is obtained at the screen H. (hint, to find this relation you can consider imaging any point of the object plane, since any object point will have an image point at H) (b) Find the relation of the magnification of the system with the distances do and di. O do H