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C4L1
Chapter 4 Lesson 1 definitions for etext
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Electromagnetic radiation | The energy transfered through space by electromagnetic waves |
Visible light | Electromagnetic radiation that can be seen with the unaided eye |
Wavelength | The distance between the crest of one wave and the crest of the next wave |
Spectrum | The range of wavelengths of electromagnetic waves |
Telescope | An optical instrument that forms enlarged images of distant objects |
Optical telescope | A telescope that uses lenses or mirrors to collect and focus visible light |
Refracting telescope | A telescope that uses convex lenses to gather and focus light |
Reflecting telescope | A telescope that uses a curved mirror to collect and focus light |
Convex lense | A lense that is thicker in the center than at the edges |
Radio telescope | A device used to detect radio waves from objects in space |
Observatory | A building that contains one or more telescopes |