Excellent tools for a variety of optical experiments, including Snell’s Law of Refraction. Glass plates cemented together. Hollow on the inside that allows liquid to be poured inside. Stopper included.

Hollow Prism (PH0552B) - 50 x 50mm
Hollow Slab (PH0552C) - 75 x 50 x 18mmm
Hollow Cube (PH0552D) - 50 x 50 x 50mm