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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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Presentation Transcript

### Light

Stop Faking It!

• 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

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

• ROYGBIV

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

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

• 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

• Compare and contrast reflection and refraction

Reflection Refraction

• Reflection: the bouncing of light from a surface

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

• 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.

• 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.

• 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

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

• Flashlight: has lenses and a mirror

• Cameras: have lenses, mirrors, and a prism

• Binoculars: have lenses and prisms

• Microscope: has lenses

• Explain the terms transparent, translucent, and opaque, and give an example of each.

Plastic wrap Wax paper Aluminum Foil

Transparent Translucent Opaque

• 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.

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

• Describe the contributions of these scientists in creating and using optical tools:

• Galileo Galilei

• Robert Hooke

• Anton van Leeuwenhoek

• Isaac Newton

• Italian

• Lived from 1564-1642

• Developed the refracting telescope

• Developed the first known example of the microscope

• English

• Lived from 1635-1703

• Devised the compound microscope and illumination system

• Discovered plant cells

• Examined fossils with a microscope

• Dutch; born in Holland

• Lived 1632-1723

• Made over 500 simple microscopes

• Discovered bacteria, free-living and parasitic microscopic protists

• 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