Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. You find that you can project a magnified image of a light bulb onto the wall of your bathroom if you hold the mirror 1.3 m from the bulb and 4.1 m from the wall. (Include the sign of each answer.)
(a) What is the magnification of the image?
(b) What is the focal length of the mirror?