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Light - Refraction.
A material is transparent if you can see through it.
If you can see through it, it means
that light can travel through
it.
Transparent materials include
air, glass, Perspex, and
water.
Light
travels at different speeds in
different materials
because they have different
densities.
The higher the density, the
slower light travels.
Light travels fastest in
space (a vacuum) and a little
slower in air.
Light moves noticeably more
slowly in glass than in air
because glass is obviously
more dense.
A line drawn at right
angles to the boundary
between the two media (air and glass) is
called a normal.
Light
which enters a glass block along a
normal does not
change direction
but it does travel more slowly through
the glass
and so its wavelength is smaller
(continued).
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Copyright © 2008 Dr. Colin France. All Rights Reserved.