Material: Glass, Size: Approx. 18 x 5.5 x 4.5 cm
30mm sides and lengths of 50, 100 and 150mm.
Prisms will create a nice rainbow (even in room light) by using the simple led light of a smart phone
The farther away you move the target the bigger the rainbow gets and the more distinct colors the user can see.
A great tool for teaching refraction and science education, or for just having fun.