Light

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# Light - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Light' - richard_edik

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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;
• Optical tools (eyeglasses, lenses, flashlight, camera, kaleidoscope, binoculars, microscope light boxes, telescope, prism, spectroscope, mirrors); and
• Historical contributions in light
Essential Knowledge, Skills, and Processes
• Explain the relationships between wavelength and the color of light. Name the colors of the visible spectrum.
• ROYGBIV
Vocabulary
• Visible spectrum (visible light): a combination of several different wavelengths of light traveling together. It is part of the Electromagnetic Spectrum.
Essential Knowledge, Skills, and Processes
• Diagram and label a representation of a light wave (wavelength, peak, trough)
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
Essential Knowledge, Skills, and Processes
• Compare and contrast reflection and refraction

Reflection Refraction

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

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.

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

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
Essential Knowledge, Skills, and Processes
• Flashlight: has lenses and a mirror
Essential Knowledge, Skills, and Processes
• Cameras: have lenses, mirrors, and a prism
Essential Knowledge, Skills, and Processes
• Binoculars: have lenses and prisms
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

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