It is possible to perform experiments on the reflection and refraction of light by water by applying a laser from various angles in a cylindrical gutter of 90 mm in diameter.
There is a magnet on the back side of the watery, so you can use it for demonstration experiments on a blackboard or group experiments using a whiteboard.
Specifications
Size: phi 130 x 28 mm (overall), phi 90 x 23 mm (water tank)