Concave Lens: 1. Go to the following web address: http://janggeng.com/convex-lens-and-concave-lens/ 2. Choose the concave lens. convex lens concave lens 3. Record f, do (s), di (s'), M and your observations of the image into Data Table 3 4. Use the slider to change the focal length and record your new data into Table 3. Table 3 Trial 1 Trial 2 f (cm) do(cm) di(cm) M Type of image: real, none, or virtual Direction of image: inverted or upright