| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| 2-word distance from the center of a lens to a point where the light rays that pass through it converge | the focal length | $1,200 | DJ | PHYSICS | 2024-05-02 | #9094 | |
| Term for the distance from the center of a lens to the pt. where parallel rays that pass through it converge | focal length | $2,000 | DJ | PHYSICS | 2007-06-20 | #5258 |