| |||
| catoptric system; reflecting system; optical system | |||
| mirror system; reflector system | |||
|
Spiegelsystem : 11 phrases in 2 subjects |
| Measuring instruments | 2 |
| Optics branch of physics | 9 |
| |||
| catoptric system; reflecting system; optical system | |||
| mirror system; reflector system | |||
|
Spiegelsystem : 11 phrases in 2 subjects |
| Measuring instruments | 2 |
| Optics branch of physics | 9 |