Concept:When light moves from a rarer to a denser medium, its speed reduces and it bends towards the normal.
Explanation:The optical density of a medium determines the speed of light in it.
In a denser medium, the speed of light decreases.
Frequency remains unchanged when light passes from one medium to another.
Since speed decreases but frequency is constant, the wavelength
λ also decreases.
According to Snell's law, a ray travelling into a denser medium refracts towards the normal.
Thus, only the statement about refraction towards the normal is true.
Answer:The light refracts towards the normal.
Correct option: C.