Lens-body acrylic, parallel and trapezoid, SE

For experiments on the optics of ray paths, refraction and calculation of displacement on plane-parallel plates, determination of the refractive index of acrylic glass, refraction on a prism, color dispersion;
Model body, one side rectangular, second side trapezoidal, upright sides highly polished, bottom side coated white for visibility of the beam path in the body
Material: Acrylic glass
Dimensions: 70 x 35 x 15 mm
Mass: approx. 40 g