C
Pounces back. On
Chapter 29 Summary
Reflechon is when a wave meets a change in medium and bounces back. On"
surfaces, waves bounce predictably. They follow the Law of Reflechis. This says that the ray going towards
the surface before the bounce is called the incident ray and the ray heading away after it bounces is called
the Reflected ray. The Law of Reflection says the angle of incidente equals the angle of
Reflech CA They are measured against a line called the normal, which is perpendicular to the surface.
On a “ Mirror " surface, waves bounce randomly. We call this Virtual Mace. Actually, they
follow the Law of _
__but the surfaces are pointing many directions. The terms “
_” and
_" are relative. If the waves are big compared to the bumps on the surface, it's ".
». If
the waves are small compared to the surface, it's "_ ". Reflected sound is called an
The best
concert halls have walls that are
_-" so that we get
and each sound goes
every direction to fill the space.
is the bending of a wave as it crosses a
_, changes
medium, and changes
Sound travels at different speeds through different air
faster in
air and slower in
_air. This can cause
of sound at the
boundary of air temperatures. Light also travels at different _through different materials. This means
light can also
as it crosses between different
_. This is why straws sitting in a glass
appear to
at the surface of the water. When the ground is much
than the air, light waves
heading towards the ground will
back up into our eyes. It looks like the ground off in the distance
is wet or a mirror but this is a
is the separation of light into order of its frequencies.
When light is forced to bend, longer
don't bend as easily as shorter
This fan
out light in order of
For visible light,
has the longest wavelength and
has the shortest. This means that in a rainbow,
will be on the outside of the curve and
will be on the inside. The
is the angle at which waves won't pass
through a boundary but refract along the surface. Farther than the
and light will be
"Trapped" inside. Continual reflection back inside is called