Q3. A lypical camera has at least one lens, and the purpose of the lens is to produce a focussed image on the camera film, as indicated in Figure 4 below. Objective Lens Figure 4. (a) By using a suitable equation and diagrams to guide you, explain why only a simple convex lens would be appropriate for the cameras purpose. You must highlight how a simple diverging lens would be unsuitable. You must explain the variables in any equations you use. (b) In an experimental setup there is a thin lens of focal length 8 cm, and an object of height 7 cm is placed 15 cm to the left of the lens. What is the height of the image? (c) A refracting telescope has a magnification of 100 and eyepiece lens with focal length of 25 mm. Use this information to determine the length of the telescope.

Q3. A lypical camera has at least one lens, and the purpose of the lens is to produce a focussed image on the camera film, as indicated in Figure 4 below. Objective Lens Figure 4. (a) By using a suitable equation and diagrams to guide you, explain why only a simple convex lens would be appropriate for the cameras purpose. You must highlight how a simple diverging lens would be unsuitable. You must explain the variables in any equations you use. (b) In an experimental setup there is a thin lens of focal length 8 cm, and an object of height 7 cm is placed 15 cm to the left of the lens. What is the height of the image? (c) A refracting telescope has a magnification of 100 and eyepiece lens with focal length of 25 mm. Use this information to determine the length of the telescope.