Semi-Circular 75mm Base, 15 mm Thick, 1 Each

The Semi-Circular 75mm Base by United Scientific is a clear acrylic semi-circular lens with a 75 mm base and 15 mm thickness. Its flat face and curved edge make it the standard block for total internal reflection, critical angle and refractive index experiments with a ray box. Physics teachers use it in student optics practicals or to replace a semi-circle missing from an existing kit.