Students learn how a telescope works. Students build two different types of simple telescopes-an astronomical and a terrestrial telescope-each with a magnification of 5X. They then experiment with the different telescope designs and determine how the lens combination in each telescope works to magnify an object's image. The Student Kit includes enough materials to build one telescope that can be used to study both the astronomical and terrestrial telescope configurations. The Classroom Set includes materials to build a total of eight telescopes-four astronomical and four terrestrial. Teacher Notes, reproducible student handouts, and all necessary specialized equipment are provided.