# Title Image Description Video
1 Disappearing Beaker

Refractive Index

Use Johnson's baby oil or Wesson oil to make a small beaker disappear when immersed.  If the beaker has graduations or words they will appear to be floating in the liquid. 

Video 1

Video 2

2 Big Plastic Refraction Tank

Refraction at Flat Surfaces

The light source can be rotated through 270 degrees to show refraction and total internal reflection for both air/plastic and plastic/air interfaces.

Video 1

Video 2