1. What type of images can be produced by a biconvex lens? What are the images produced by a biconcave lens? Are they the same?
2. Compare the ray diagrams and the images formed by a single concave mirror and a biconvex lens.
3. Do the same for the convex mirror and the biconcave lens. What did you notice?
4. Does the material a lens is made of play a role in the determination of the focus of the lens? Explain.

Make a new thread and complete the following about thereal-world applications of lenses.

1. A camera lens used for taking close-up photographs has a focal length of 22.0 mm. The farthest it can be placed from the film is 33.0 mm.
2. What is the closest object that can be photographed? What is the magnification of this closest object?
3. What is power of a lens? Calculate the power of the camera lens used in this example.
4. Answer the questions above, then summarize your observations and conclusions,and include them in your second post along with the calculations.