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Reflection
Refraction
Total Internal Reflection
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Reflection occurs when a light ray hits an object,
and results in bouncing off it.
Total Internal Reflection (TIR) is the phenomenon that occurs when light travels from an optically dense medium to a less optically dense medium. Furthermore, the incident ray is at an angle that's past the critical angle.
Refraction is the phenomenon that occurs when a light ray hits a new medium, causing the ray of light to bend.
