1. Refraction is caused by the waves changing direction
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2. When waves slow down they bend ___________ the normal
- Away from
3. When light enters glass or plastic it does what?
- Slows down
- Stays the same
- Speeds up
4. if light hits a boundary at 90°, along the normal, it'll slow down but not change direction
5. Above a certain angle of incidence, called the critical angle, how much of the light will be reflected back?
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