Download - Light
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HOW LIGHT MOVES
Straight Line unless altered by what moving in.
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LIGHT SCATTERS AS GOESLight scatters and looses energy
the further away from its source.
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SCATTERING• Light released and spreads in
all directions.
–Why room is even with light.
–Sky blue: shortest wavelengths, spread more.
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REFLECTIONREFLECTIONLight bounces off surface at
same angle it hits.
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These are good reflections, aren’t they?
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ABSORPTION• LIGHT IS TAKEN IN BY AN
OBJECT (MATTER) AND HOLDS IT.
• ENERGY TRANSFERRED FROM LIGHT TO HEAT.
• AIR PARTICLES DIMINISH LIGHT.
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TRAVELS THRU MATTER
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INTERACTS WITH MATTER
TRANSMISSION
• Light goes straight unless changes what it travels through.
• Travels through matter: gases (air), liquids (water) and solid (glass).
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TRANSMISSION: Terms for mediums
• Transparent- allows all light through.
• Translucent- allows some light through.
• Opaque- allows no light through.
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CLEAR=TRANSPARENT
SMOKY=TRANSLUCENT
SOLID=OPAQUE
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When Light Strikes an Object
When light strikes an object, the light can be reflected, transmitted, or absorbed.
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REFRACTION• The change in direction and
speed.
• Moving from water to air, light changes angles and speed of travel.
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Refraction of LightWhen light rays enter
a medium at an angle, the change in speed causes the rays to bend, or change direction.
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LENSESAlter direction of light.
• Concave-spreads out.
• Convex- brings to focal point.
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LENSES con’tCONVEX
-brings image to focal point.
Image is larger and upside down.
ie: eye, microscope,
magnifying glass.
CONCAVE-spreads image
out.-image is smaller
and upright.ie: corrective
glasses.
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Vision: response to the stimulus of light.
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Scattered light enters the Eye
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ONCE ENTERS
LIGHT SEEN
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The eye works like a camera.
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REVIEWLight with Matter
TRANSMISSION- light going through
REFRACTION-light bending.ABSORBTION- light absorbed.REFLECTION- light bouncing
off.
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What Is the Electromagnetic Spectrum?
• The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency.
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VISIBLE LIGHT (part of EM spectrum)
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Light travels thru water
(why we see blue best)
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TO SEE COLOR• Different colors represent
different wavelengths.• Blue- smaller wavelengths• Red- larger wavelengths• Color Order: ROY G BIVred, orange, yellow, green, blue,
indigo, violet
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CSS 6eWHITE LIGHT
Adding color makes WHITE
Deleting color makesBLACK
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MANY COLORS = WHITE
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WHITE LIGHT• Mixture of many
color/wavelengths• All colors reflected.• Enters the eye’s retina
–3 cones:red, blue & green–Rods-shades
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Electromagnetic Waves
• Believe it or not, you are being “showered” all the time, not by rain but by waves.
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COLOR-decided by what absorbed.
If object absorbs then hides color.
• All color absorbed = black
If object reflects color then
see.
• All color reflected =
white
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