| Spectroscopic device with two flat parallel reflecting surfaces used to measure wavelengths |
Mirror Quiz |
16 Feb 2025 |
| Claw on base for optical instrument (6) |
|
|
| Stripping off, never mind getting a measuring device |
|
|
| Reflecting device producing interfering light beams |
The Times Concise |
01 Jul 2015 |
| Wavelength reader from eastern stock |
|
|
| Distance-measuring instrument |
|
|
| Interferometer |
|
|
| Standard: Fr. |
|
|
| An interferometer. |
|
|