You have a convex lens with a focal length of 11.3cm. You want to use it to project an image from your cell phone's screen onto a wall that is 198cm away from the lens. How big the image would be on the wall compared to the image on your phone's screen, i.e. what is the magnification?

Hint: Combine the lens equation with the equation for magnification to eliminate .do. Make sure to include the correct sign in your answer.