An overhead projector produces an image of an object (transparency) on a distant screen by using a light source, a plane mirror, and a converging lens (f = 50 cm). The distance between the lens and the mirror is 15 cm.
(a) If you wish to project a focused image on a screen 3.0 m away from the lens, what distance above the transparency must you set the center of the mirror–lens combination?
(b) Describe how you must place the transparency on the projector so that the image is oriented right-side-up on the screen.