Sinec the light rays bends away from the normal when it enters into medium 2, the denser medium is medium 1.
What is refraction?
Refraction is the bending of light waves at the boundary of media of different densities.
During refraction, if light travels from less dense to a denser medium, the light rays is bent towards the normal.
However when light travels from denser to less dense medium, the light rays bends away from the normal.
Therefore, since the light rays bends away from the normal when it enters into medium 2, the denser medium is medium 1.
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