Posted by : Dr. Keyur Patel Thursday 17 July 2014

Total internal reflection is a phenomenon that happens when a propagating wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

The demonstration of the phenomenon can simply explained by Total Internal Reflection in water stream


Material required: Laser pointer, bottle, water, etc.

Description: First drilling a hole near the bottom of the bottle.  The diameter of a hole is slightly larger than the diameter of the laser that will be used. Fill the 
bottle with water. Place the laser straight through the bottle at the hole. When you turn on the laser it travels in the stream of water. This is due to the laser light exhibiting total internal reflection.

Note: One can also add a small amount of powdered milk in water.

Different Models: 

 
   
 
 

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