| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Telescopes using a front lens to collect light are refracting; ones using a rear mirror are this type | reflecting | $200 | J | ASTRONOMY | 1994-04-21 | #2229 | |
| Isaac Newton built the 1st telescope of this type | reflecting | $200 | J | ASTRONOMY | 1989-06-19 | #1121 |