Reflecting Telescope
- Mirrors instead of lenss
- Usually have two mirrors
- Configurations
- Newtonian
- Cassegrain
- Nasmyth/Coudé
- Commonly used as professional telescopes
Advantages
- No chromatic aberration
- All wavelengths of light reflect off the mirror the same
- Easily made to be big
- Cheaper than refractors of the same size
- Only one side of the objective needs to be perfect (reflecting vs. passing through)
Disadvantages
- Easy to get optics out of alignment
- Optics need frequent cleaning
- Two mirrors --> can produce diffraction effects
Telescope