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LIGHT S. O. L. 5. 3 Created by Lori Kessinger
LIGHT S.O.L Created by Lori Kessinger th Grade Teacher Critzer Elementary 2007
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Take a look around the classroom
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Lights OFF! How well can you see now?
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How do we see? Our eyes only see what light allows us to see.
Objects we see either produce or reflect light.
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What is Light? Light is not matter! You can never observe a piece of light at rest. Light is a form of energy. Light is a way of transferring energy. Ex: heat
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Light Facts Light travels much faster than sound.
It travels at 186 miles per second. It takes on 8 ½ minutes for the sun’s rays to reach Earth. Unlike sound, light can travel in a vacuum.
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More Light Facts When light hits an object, it is either absorbed, reflected, or transmitted. Smooth, hard objects reflect light best. Mirrors are excellent reflectors!
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Is light white? What appears in the sky when the sun comes out after a rainstorm? Why does this happen?
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What causes rainbows? In a rainbow, raindrops in the air act as tiny prisms. Light enters the raindrop, reflects off of the side of the drop and exits. In the process, it is broken into a spectrum just like it is in a triangular glass prism, like this:
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Is light white? Light appears to be white. However, it is actually made of many different colors. A prism separates the colors that make up white light. A prism is a triangular piece of cut and polished glass.
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Visible Spectrum ROY G BIV
The visible spectrum is the band of different colored light waves that vibrate at various frequencies. The colors in the visible spectrum can be remembered using the acronym: Red Orange Yellow Green Blue Indigo Violet ROY G BIV BrainPOP
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Does Light Travel? Light travels in a straight path called a light ray. Light rays are characterized by their waves. Red light has the longest wavelength. Violet has the shortest wavelength.
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There are three parts to a light wave
Wavelength – distance from one peak to another Peak – top of the wave Trough – bottom (valley) of the wave Frequency- the number of waves that occur in 1 second
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Parts of a Wave
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Bouncing Light When light BOUNCES off of a surface, it is called REFLECTION. Light reflects off at the exact same angle as the original light beam!
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Law of Reflection When light hits a surface, the angle at which it is reflected is the same as the angle at which it strikes. Example: Bounce a ball to someone standing across from you.
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Bending light When light is BENT it is called REFRACTION.
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Through which materials do light travel best?
TRANSPARENT objects let MOST of the light through. Examples: Transparency Clean water Siran wrap Window glass Air
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Which materials allow SOME light to pass through?
TRANSLUCENT Examples: Wax paper Tracing paper Empty soda bottle Frosted glass Tissue paper Notebook paper
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What is the name of an object that allows NO light to pass through?
OPAQUE Examples: Brick Wood Book Tin foil Table top
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Convex Lens Always produce an upright image Makes things look larger
Brings light rays together
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Concave Lens Curved inward and forms many different images
Spreads out light rays
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Lenses in Our World Convex Lenses glasses microscopes telescopes
Concave Lenses glasses movie projector cameras
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Galileo Galilei Italian physicist who built the first telescope Discovered mountains on moon, moons of Jupiter and the Milky Way
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Robert Hooke 1632- 1723 English researcher
Constructed multiple lens microscope Discovered plant cells
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Anton van Leeuwenhoek 1632-1723
Dutch scientist Improved microscope Discovered bacteria and protozoa
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Isaac Newton Showed white light can be separated into visible spectrum with prism Built first reflecting telescope Studied modern optics
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Thomas Edison Invented first practical light bulb
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