Light & Matter
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Transcript Light & Matter
Light & Matter
We
see the objects around
us because light waves are
reflected off objects to our
eyes.
Light & Matter
Opaque
objects only
reflect light,
they do not
allow light to
pass through.
[http://www.harcourtschool.com/glossary/science/images/gr6/trans_opaque6.jpg]
Light & Matter
Translucent
objects allow
light to pass
through, but
you cannot
see clearly
through them.
[http://www.harcourtschool.com/glossary/science/images/gr6/trans_opaque6.jpg]
[http://images.google.com/images?q=tbn:WAydjyn5nFEJ:gnr8.typepad.com/gnr8_news/images/concrete1.jpg]
Light & Matter
Transparent
objects allow
you to see
light clearly
through them.
Examples on
pgs. 420-421
[http://www.harcourtschool.com/glossary/science/images/gr6/trans_opaque6.jpg]
Reflection of Light
Regular Reflection
occurs when light
waves bounce off a
smooth surface.
Usually you see a
reflection, like with
mirrors or windows.
Law of Reflection
[http://cougar.slvhs.slv.k12.ca.us/~pboomer/physicstextbook/fig13-3.jpg]
Click Here for a Regular Reflection Example
Reflection of Light
Diffuse Reflection
occurs when light
waves bounce off
rough surfaces.
This occurs with
most objects we
see.
[http://upload.wikimedia.org/wikipedia/en/thumb/7/79/Diffuse_reflection.PNG/180px-Diffuse_reflection.PNG]
Refraction of Light
When
a wave
changes
mediums it
slows down
and bends.
Refraction of Light
Index of refraction How much a material
changes the path of
a light wave.
The larger the index,
the more it bends.
[http://micro.magnet.fsu.edu/optics/lightandcolor/images/refractionfigure1.jpg]
Click here for a
refraction animation
Click Here for the Disappearing
Beaker Demo
Refraction of Light
Prisms bend
“white light”
enough to split it
into the colors of
the rainbow.
Refraction of Light
Red
has the
largest
wavelength and
bends the least.
Violet is the
opposite.
[http://selfpursuit.com/files/2007/08/wp-contentuploadsspectrum.jpg]
Refraction of Light
Mirages occur
when light is
refracted through
different densities
of air.
Usually air is
warmer right
above pavement.
[http://ophtasurf.free.fr/mirages/mirage2.jpg]