Portable Refraction Tank

This ingenious device makes it easy to demonstrate light refraction. Apparatus holds water in a sealed, round, 90mm diameter tank, and is equipped with a light source and slit. Students can change the incident angle of light by moving the tank, making the apparatus ideal for simple and accurate measurement of light refraction and incident angle. Includes 2 AA batteries. Measures 170mm x 100mm x 35mm.