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This modular activity introduces five major pre-requisite ideas: the electromagnetic spectrum, three ways to alter the path of light, refraction by lenses vs. reflection by mirrors, what telescopes do, and what makes a good telescope. Students can work through the activity independently or in groups. After completing this activity students will be able to identify basic properties of light from the electromagnetic spectrum to refraction and reflection. This modular activity is a section of the “Get To The Root of It” included in the online activity “Telescopes From The Ground Up.” Detailed teacher pages, identified as Teaching Tips on the title page of the activity, provide science background information, lesson plan ideas, related resources, and alignment with national education standards.