Light enters from air into the following media successively and finally emerges.
| Medium | Refractive Index |
| A | 1.5 |
| B | 1.26 |
| C | 1.33 |
| D | 1.0 |
| E | 2.0 |
1
decrease, increase, decrease, increase, decrease, increase
2
increase, decrease, increase, decrease, increase, decrease
3
decrease, increase, increase, decrease, increase, decrease
4
increase, decrease, increase, increase, decrease, increase