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When light waves propagate from one medium to another medium with a different refractive index, refraction occurs.
The incident angle and reflection angle will satisfy the following formula:
n1：The refractive index of medium 1.
n2： The refractive index of medium 2.
θ1：The angle between the incident light wave and the interface normal.
θ2：The angle between the refracted light wave and the interface normal.