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Chapter 4 Lesson 1 definitions for etext

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
Created by: Yaboy692