A student observes that the incident ray, the refracted ray, and the normal at the point of incidence all lie in one plane. Which law of refraction does this illustrate?
First law of refraction
The first law of refraction states that the incident ray, the refracted ray, and the normal to the surface at the point of incidence all lie in the same plane.
The second law of refraction (Snell's law) relates to the constant ratio of the sines of the angles of incidence and refraction.
Hence, this is the correct answer.
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