Hollow Glass Prism with Stopper, 3 x 2 x 0.7"

This Eisco Labs Hollow Glass Prism with Stopper is a rectangular fillable glass box approximately 3" x 2" x 0.7" in size, designed for physics and educational use. The fillable design allows students to add liquids of different refractive indices and study how light bends as it passes from one medium to another — an excellent setup for demonstrating Snell's Law of refraction. Note that thickness may vary slightly between units, and minor cosmetic imperfections may be present that do not affect physical function.