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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 l.jpg

Light

Stop Faking It!


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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


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Essential Knowledge, Skills, and Processes

  • Explain the relationships between wavelength and the color of light. Name the colors of the visible spectrum.

  • ROYGBIV


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Vocabulary

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


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Essential Knowledge, Skills, and Processes

  • Diagram and label a representation of a light wave (wavelength, peak, trough)


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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


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Essential Knowledge, Skills, and Processes

  • Compare and contrast reflection and refraction

Reflection Refraction


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Vocabulary

  • Reflection: the bouncing of light from a surface

  • Refraction: the bending of light as it passes through one material to another


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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.


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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.


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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


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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


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Essential Knowledge, Skills, and Processes

  • Flashlight: has lenses and a mirror


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Essential Knowledge, Skills, and Processes

  • Cameras: have lenses, mirrors, and a prism


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Essential Knowledge, Skills, and Processes

  • Binoculars: have lenses and prisms



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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


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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.


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Essential Knowledge, Skills, and Processes

  • Analyze the effects of a prism on white light and describe why this occurs. Explain why a rainbow occurs.


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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


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Galileo Galilei

  • Italian

  • Lived from 1564-1642

  • Developed the refracting telescope

  • Developed the first known example of the microscope


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Robert Hooke

  • English

  • Lived from 1635-1703

  • Devised the compound microscope and illumination system

  • Discovered plant cells

  • Examined fossils with a microscope


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Anton van Leeuwenhoek

  • Dutch; born in Holland

  • Lived 1632-1723

  • Made over 500 simple microscopes

  • Discovered bacteria, free-living and parasitic microscopic protists


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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