Date post: | 14-Jan-2016 |
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What do we know about light?
Light and Color
Properties of Light
Light travels in straight paths:
Laser
Light travels VERY FAST-around 300,000 kilometers per second.
At this speed it can go around the world 8 times in one second.
Light travels much faster than sound.
Thunder and lightning
start at the same time,
but we will see the lightning
first.
• We see things because they reflect light into our eyes:
Homework
Transparent
Light passes through objects in varying amounts.
Opaque
Translucent
What happens when light hits an object?
Light refracts.
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
CD micro- structure
Peacock FeatherMicro-lamellae
• Reflection from a mirror:
Incident ray
Normal
Reflected ray
Angle of incidence
Angle of reflection
Mirror
Law of Reflection
When a ray of light is reflected from asmooth surface, the angle of reflection
is equal to the angle of incidence.
Normal Line
Credit to Rory Gates 10 years old