Fluorescein Tank - Total Internal Reflection

Demo

A green laser is shown into a narrow tank of fluorescein.  A small mirror reflects the beam up into the water.

Concept Overview:

1. Total Internal Reflection

2. Reflection

Lecturer Procedure

Step(s) to Follow Expected Result

1. Turn on the laser

2. Pull up on string until laser beam reaches critical angle

Upon reaching a critical angle, the beam will be reflected in a zig-zag pattern throughout the tank. 

See Below:

When the mirror is lifted, the beam reflects internally and zig zags through the liquid

Video: 
Transcript: 

There is no audio with this recording.

Identifier: 
L: GO - 003