Total Internal Reflection in a Stream of Water

Water drains from a lucite box as a laser is shown into it

Concept Overview:

1. Total Internal Reflection

**Lecturer Procedure**
Step(s) to Follow	Expected Result
Remove plug	Water will drain, but no laser beam will be visible until the box has run out of water. (see below)

Laser beam follows the stream of water and is not visible:

Close-up image of draining water

Once water has drained from box, laser beam is visible on surface across from laser:
Laser is visible on the wall after water has drained from box