What do we know about light?

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What do we know about light?
Light and Color
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Properties of Light

• Light travels in straight paths

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• Light travels VERY FAST-
• around 300,000 kilometers per
• second.

At this speed it can go around the world 8 times
in one second.
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• Light travels much faster than sound.

Thunder and lightning start at the same time, but
we will see the lightning first.
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• We see things because they reflect light into our
  eyes

Homework
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Light passes through objects in varying
amounts.
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What happens when light hits an object?
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Light refracts.
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What color is reflected? Does the color seem to change where it is when the light moves? Pigment or Iridescence?
Fabric Square 1
Fabric Square 2
Fabric Square 3
CD
Feather 1
Feather 2
Black Square

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Peacock Feather Micro-lamellae
CD micro- structure
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• Reflection from a mirror

Normal
Reflected ray
Incident ray
Angle of reflection
Angle of incidence
Mirror
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Law of Reflection   When a ray of light is
reflected from a smooth surface, the angle of
reflection is equal to the angle of incidence.
Normal Line
Reflected ray
Incident ray
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Credit to Rory Gates 10 years old
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Light reflects-we see things because they
reflect light into our eyes.
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Light travels in straight lines.