33. Geometric Optics

You place a pencil in front of a concave lens with a focal length of . The magnification of the image is $m=\frac{1}{2}$. If you wanted to make the image even smaller, should you move the pencil closer to the lens or farther away?

An object is placed to the left of a convex lens, an image is formed to the right of the lens. What is the focal length of this lens?