- Refraction is the phenomenon of light bending when it travels from one medium to another medium.
- Refraction occurs because the velocity of light changes when it travels from a medium into another medium.
The law of refraction states that:
- The incident and refracted rays are on opposite sides of the normal at the point of incidence and all three are in the same plane.
- The ration of sin i / sin r is a constant. This constant is called refractive index.
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