Java Security Update: Oracle has updated the security settings needed to run Physlets.
Click here for help on updating Java and setting Java security.
Problem 35.8: Find the focal length of each lens in the 2-lens system
Please wait for the animation to completely load.
A light source is located to the left of two lenses (position is given in centimeters). You can click-drag either lens through a limited range of x positions. Find the focal length of each lens. Restart.
Problem authored by Melissa Dancy.