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What is light energy and how is it used? Learning Objectives I will know what light energy is. I will know how light energy can be used. I will know how light travels. I will know that light energy can be reflected or refracted. Refracting Telescope Hey, my father let me use his refracting telescope. I wanted to get a better look at the moon. I read about telescopes while I was writing a report on Galileo. He used a refracting telescope over 400 years ago. This type of telescope uses lenses to refract light and magnify the image, making it seem larger. How Light Travels Light can pass through some materials and not others. opaque transparent translucent Light Changes Direction reflected Light is ___________ by a mirror. refracted Light is ___________ by a lens. Reflection and Refraction Look around the classroom. Which objects reflect and which refract? Object Reflect or Refract? window desk bowl of water window eyeglasses refract reflect refract book reflect t-shirt reflect reflect refract Light Waves and Color Visible light has wavelengths between violet and red. R O Y G wavelength B V The Electromagnetic Spectrum Optical Instruments microscope to view faraway objects like stars telescope to reflect a person’s image mirror to improve a human’s vision optical lens to magnify very small things