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The law of refraction states that the incident ray, the refracted ray, and the normal to the interface, all lie in the same plane.
The laws of refraction govern the behaviour of light as they pass through the interface between two media. It is generally known as Snell’s Law. From the above-depicted activity, we can say that refraction of light follows two laws.
Laws of Refraction of Light · The incident ray refracted ray, and the normal to the interface of two media at the point of incidence all lie on the same plane.