Trapezoid Prism, 1 Each

The Trapezoid Prism by United Scientific is a clear acrylic trapezoid with one flat surface frosted so light paths show inside the shape. Its bases measure 89 mm and 40 mm, and its faces 47 mm and 35 mm. Physics teachers use it with a ray box for refraction and ray-tracing activities, or to add a trapezoid shape to existing student optics kits.