How to do Q3?

3. A simple camera consists of a convex lens of focal length 40 mm. A man uses the camera to take a photograph of a distant object. (a) In order to obtain a clear picture, should the distance between the lens and the film be greater than, equal to or small than 40 mm? Explain your answer briefly. (b) State the nature of the image formed by the lens. Optics / Chapter 3 Lenses / Homework 11 / 2022-2023 /P.2