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Science
Waves
Reflection and refraction
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Refraction
Waves can
change direction
when they change
speed
moving from one
medium
to
another
Refraction
can happen when any wave
changes
speed as it
passes
from
one
medium
to another
If
waves
enter or
leave
the
medium
at
right
angles to the
surface
(along the normal), they
do
not
change direction