This kit provides a complete set of optical and mechanical components as well as light sources, which can be conveniently assembled into setups to conduct experiments in geometrical optics. Through selecting and assembling the corresponding components into setups, students can enhance their experimental skills and problem solving ability. Experiment examples: 1.Measurement of the focal length of a convex lens based on self-collimation 2.Measurement of the focal length of a convex lens based on Bessel method 3.Measurement of the focal length of a convex lens based on lens imaging equation 4.Measurement of the focal length of a concave lens 5.Measurement of the focal length of an eyepiece 6.Measurement of the nodal locations and the focal length of a lens-group 7.Measurement of the magnification of a microscope 8.Measurement of the magnification of a telescope 9.Construction of a slide projector