Suppose you have a lens with a focal length of 20 cm, about 8 inches. This is typical of large low power magnifying glass you might use to work a crossword puzzle. Let's use this lens to form an image of distant trees on a piece of paper, and then again of a light bulb 16 inches (about 40 cm) away. What happens? Pick the two answers that are correct. The lamp focuses on the paper also when the paper is 8 inches, 20 cm, behind the lens. The trees focus at 8 inches, 20 cm, from the lens. The lamp does not come into focus. There's no way to use this lens to form an image of the lamp that close. The lamp focuses behind the lens too, but at 16 inches rather than 8