PASCO’s Basic Optics System is easy-to-use, affordable, and ruggedly designed. Large, 50 mm diameter optics components are mounted in protective holders that snap directly onto the aluminum track, allowing students to easily adjust components by snapping or sliding them along the track. Image and object distances for both lenses and mirrors can be measured quickly and accurately with the built-in metric tape. The Light Source doubles as a tabletop ray box for studies in reflection, refraction, color addition, and Snell’s Law. All of the components, with the exception of the track, fit in the included storage box.