Look up two things:
index of refraction
Snell's law (of refraction)
Both will have equations associated with the definitions. Figure out what you can.
If you're feeling ambitious, look for a derivation of Snell's law. You may not be able to follow it, and that's quite ok; however, if it's the geometry version, which we'll cover next class, you may want a heads-up on it.
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