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Why does light bend when it enters water?

Trace light as it moves between air and water.

ScienceClass 104 min video

$Preview of the refraction video showing a pencil appearing bent in water$ 3:34

What you'll learn

1Why light changes direction
2How the normal helps describe bending
3When light bends toward or away from the normal

What happens next

Watch short videoTrace light as it changes speed between air and water.Try interactive experimentInteractive activity coming soon.Quick check quizTest what you've learned.