Optical experiment, physics teaching instrument, physics experiment,Study the propagation path of light,Convergence of light, Light divergence, Refraction of light, Straight propagation of light Lightweight and Precise Parallel Bar Optical Bench with Scale, Includes a set of accessories for lens and mirror experiments Through experiments on multiple projects, understand how light travels, reflect, refract and study optics The guide rails are marked with scales to facilitate observation and sumThe clearly illustrated manual encourages critical thinking by asking you questions before and after doing the experiments Ideal for teachers, home school, and young scientist. Ideal for teachers, home school, and young scientist