c. It slows down because water is more dense than air.
As a light wave travels from air into water, it slows down because it is entering a medium that has a higher density than air. This change in speed causes the light wave to bend, or refract, as it passes through the boundary between the two mediums.
Describe how a light wave changes as it travels from the air into water.
a
It slows down because water is less dense than air.
b
It speeds up because water is more dense than air.
c
It slows down because water is more dense than air.
d
It speeds up because water is less dense than air.
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