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]