Lenses
A lens is a piece of transparent material shaped such that parallel light rays are refracted towards a point, a focus:
- Convergent Lens
- light moving from air into glass
will move toward the normal
- light moving from glass back into
air will move away from the normal
- real focus
- Divergent Lens
- light moving from air into glass
will move toward the normal
- light moving from glass back into
air will move away from the normal
- virtual focus