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Light

Light. Stop Faking It!. Strand: Force, Motion, and Energy. SOL 5.3 The student will investigate and understand basic characteristics of white light. Key concepts include: The visible spectrum, light waves, reflection, refraction, diffraction, opaque, transparent, translucent;

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Light

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  1. Light Stop Faking It!

  2. Strand: Force, Motion, and Energy • SOL 5.3 The student will investigate and understand basic characteristics of white light. Key concepts include: • The visible spectrum, light waves, reflection, refraction, diffraction, opaque, transparent, translucent; • Optical tools (eyeglasses, lenses, flashlight, camera, kaleidoscope, binoculars, microscope light boxes, telescope, prism, spectroscope, mirrors); and • Historical contributions in light

  3. Essential Knowledge, Skills, and Processes • Explain the relationships between wavelength and the color of light. Name the colors of the visible spectrum. • ROYGBIV

  4. Vocabulary • Visible spectrum (visible light): a combination of several different wavelengths of light traveling together. It is part of the Electromagnetic Spectrum.

  5. Essential Knowledge, Skills, and Processes • Diagram and label a representation of a light wave (wavelength, peak, trough)

  6. 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

  7. Essential Knowledge, Skills, and Processes • Compare and contrast reflection and refraction Reflection Refraction

  8. Vocabulary • Reflection: the bouncing of light from a surface • Refraction: the bending of light as it passes through one material to another

  9. Essential Knowledge, Skills, and Processes • Design an investigation to determine what happens to light as it passes through a convex lens. Describe the results. A convex lens causes light to converge, or focus, producing an image that is smaller than the original object.

  10. Essential Knowledge, Skills, and Processes • Design an investigation to determine what happens to light as it passes through a concave lens. Describe the results. A concave lens causes light to diverge, or spread out, producing a larger image than the original.

  11. Essential Knowledge, Skills, and Processes • Identify some common optical tools, and describe whether each has lenses, mirrors, and/or prisms in it. These should include: • eyeglasses • flashlights • cameras • binoculars • microscopes

  12. No correction needed a. Normal eye Corrected with concave lens b. Myopia (nearsightedness) c. Hyperopia (farsightedness) Corrected with convex lens Essential Knowledge, Skills, and Processes • Eyeglasses: have lenses

  13. Essential Knowledge, Skills, and Processes • Flashlight: has lenses and a mirror

  14. Essential Knowledge, Skills, and Processes • Cameras: have lenses, mirrors, and a prism

  15. Essential Knowledge, Skills, and Processes • Binoculars: have lenses and prisms

  16. Essential Knowledge, Skills, and Processes • Microscope: has lenses

  17. Essential Knowledge, Skills, and Processes • Explain the terms transparent, translucent, and opaque, and give an example of each. Plastic wrap Wax paper Aluminum Foil Transparent Translucent Opaque

  18. Vocabulary • Transparent: materials that allow all light to pass through • Translucent: letting light through but scattering it • Opaque: materials that do not let light through • Transmit: to send (as in sound or light). It also means light passing through an object.

  19. Essential Knowledge, Skills, and Processes • Analyze the effects of a prism on white light and describe why this occurs. Explain why a rainbow occurs.

  20. Essential Knowledge, Skills, and Processes • Describe the contributions of these scientists in creating and using optical tools: • Galileo Galilei • Robert Hooke • Anton van Leeuwenhoek • Isaac Newton

  21. Galileo Galilei • Italian • Lived from 1564-1642 • Developed the refracting telescope • Developed the first known example of the microscope

  22. Robert Hooke • English • Lived from 1635-1703 • Devised the compound microscope and illumination system • Discovered plant cells • Examined fossils with a microscope

  23. Anton van Leeuwenhoek • Dutch; born in Holland • Lived 1632-1723 • Made over 500 simple microscopes • Discovered bacteria, free-living and parasitic microscopic protists

  24. 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

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