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Light
 

Light

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    Light Light Presentation Transcript

    • Objectives: The student will investigate and understand basic characteristics of white light. Key concepts include: • The visible spectrum, light waves, reflection, refraction, diffraction, opaque, transparen t, translucent; • Optical tools (eyeglasses, lenses, flashlight, camera, kaleidoscope, binocul ars, microscope light boxes, telescope, prism, spectroscope, mirrors); and Explain thecontributions in light • Historical relationships between wavelength and the color of light. Name the colors of the visible spectrum.
    • Vocabulary: • Waves: a disturbance which carries energy and that travels away from the starting point. • Wavelength: the distance between one crest of a wave and the next crest (distance between compressions); red is longest and violet is shortest • Peak: the highest point of a light wave • Trough: the lowest point of a light wave • Frequency: the number of waves (light or sound) produced in a given unit of time, such as a second
    • • Reflection: the bouncing of light from a surface• Refraction: the bending of light as it passesthrough one material to another• Visible spectrum (visible light): a combination ofseveral different wavelengths of light travelingtogether. It is part of the Electromagnetic Spectrum.
    • Diagram Representation of Light Wave
    • Reflection Refraction
    • A convex lens causes light to converge, or focus,producing an image that is smaller than theoriginal object.
    • A concave lens causes light to diverge, or spread out,producing a larger image than the original.
    • • eyeglasses• flashlights• cameras• binoculars• microscopes
    • Eyeglasses: have lenses
    • Flashlight: has lenses and a mirror
    • Cameras: have lenses, mirrors, and a prism
    • Binoculars: have lenses and prisms
    • Microscope: has lenses
    • Plastic wrap Wax paper Aluminum FoilTransparent Translucent Opaque
    •  Transparent: materials that allow alllight to pass through Translucent: letting light through butscattering it Opaque: materials that do not let lightthroughTransmit: to send (as in sound or light).It also means light passing through anobject
    • Galileo Galilei • Italian • Lived from 1564-1642 • Developed the refracting telescope • Developed the first known example of the microscope
    • Robert Hooke • English • Lived from 1635-1703 • Devised the compound microscope and illumination system • Discovered plant cells • Examined fossils with a microscope
    • Anton van Leeuwenhoek• Dutch; born in Holland• Lived 1632-1723• Made over 500 simple microscopes• Discovered bacteria, free-living and parasitic microscopic protists
    • Isaac Newton• English• Lived from 1643-1727• Discovered that white light was not a simple entity, but splits into a range of colors• When he passed white light through a glass prism, he noted that a spectrum of light was formed; particle theory of light• Reflecting telescope