S 1. A lens is positioned 240 mm from the object being imaged and the image is formed 45 mm behind the lens. What is the focal length of the lens? 2. Calculate the focal length of a lens if an object with a width of 285 mm is to be imaged on a CCD detector with a width of 15.4 mm. The distance of the object from the lens is to be 150 mm. 3. If a lens with a focal length of 6.00 mm is used to record the image of an object with a width of 285 mm placed at a distance of 150 mm from the lens, what is the image size? 4. If a camera with a detector width of 15.4 mm is used to record the image of an object with a width of 285 mm using a lens with a focal length of 8 mm, what is the distance of the object from the lens? 5. A lens with a focal length of 25 mm is positioned 150 mm from the object being imaged. What is the distance that the lens should be placed from the detector