You need a Java-capable browser such as Netscape 2 for Windows or Netscape 3 for Macintosh to be able to work with these problems. Solve the problem and enter your solution using the scrollbars and radio buttons.
Hint: Farsighted people need double-convex lenses, while nearsighted people need convex-concave lenses.
©1996, Kenneth R. Koehler. All Rights Reserved.